I haven't seen any issues like this. QMC2 uses zlib / minizip or libarchive to create ZIPs. If they produce wrong headers occasionally, then that's probably an issue upstream, but again, I haven't seen this yet.

All of them look good here, I just recently recreated my complete collection with QMC2 0.183:

Code
rene@marvin:~/src/qmc2> unzip -vl /home/games/mame/roms/cbombers.zip
Archive:  /home/games/mame/roms/cbombers.zip
 Length   Method    Size  Cmpr    Date    Time   CRC-32   Name
--------  ------  ------- ---- ---------- ----- --------  ----
  524288  Defl:N    47515  91% 2017-02-19 14:59 b9f48284  d83_39.ic17
  524288  Defl:N    97998  81% 2017-02-19 14:59 a2f4c8be  d83_41.ic4
  524288  Defl:N    53321  90% 2017-02-19 14:59 b05f59ea  d83_40.ic3
  524288  Defl:N   105601  80% 2017-02-19 14:59 0a10616c  d83_38.ic16
  131072  Defl:N    43101  67% 2017-02-19 14:59 4f49b484  d83_26.ic37
  131072  Defl:N    53746  59% 2017-02-19 14:59 2aa1a237  d83_27.ic38
  131072  Defl:N    17894  86% 2017-02-19 14:59 06328ef7  d83_28.ic26
  131072  Defl:N     4360  97% 2017-02-19 14:59 771b4080  d83_29.ic27
 2097152  Defl:N   450973  79% 2017-02-19 14:59 79f36cce  d83_04.ic8
 2097152  Defl:N   456468  78% 2017-02-19 14:59 7787e495  d83_05.ic7
 2097152  Defl:N  1099150  48% 2017-02-19 14:59 4b71944e  d83_06.ic28
 2097152  Defl:N   996271  53% 2017-02-19 14:59 29861b61  d83_07.ic30
 2097152  Defl:N   806640  62% 2017-02-19 14:59 a0e81e01  d83_08.ic32
 2097152  Defl:N   490088  77% 2017-02-19 14:59 7e4dec50  d83_09.ic45
 1048576  Defl:N   344322  67% 2017-02-19 14:59 a790e490  d83_11.ic41
 1048576  Defl:N   312832  70% 2017-02-19 14:59 2f237b0d  d83_12.ic29
 1048576  Defl:N   248671  76% 2017-02-19 14:59 c2cceeb6  d83_13.ic31
 1048576  Defl:N   151660  86% 2017-02-19 14:59 8b6f4f12  d83_14.ic44
 2097152  Defl:N   456037  78% 2017-02-19 14:59 36c440a0  d83_10.ic43
 1048576  Defl:N   163590  84% 2017-02-19 14:59 1b71175e  d83_15.ic42
 1048576  Defl:N   352408  66% 2017-02-19 14:59 d364cf1e  d83_16.ic19
 1048576  Defl:N   349958  67% 2017-02-19 14:59 0ffe737c  d83_17.ic5
 1048576  Defl:N   164264  84% 2017-02-19 14:59 87979155  d83_18.ic6
  262144  Defl:N    27608  90% 2017-02-19 14:59 85c37961  d83_31.ic10
  262144  Defl:N    60952  77% 2017-02-19 14:59 b0db2559  d83_32.ic11
  262144  Defl:N     7642  97% 2017-02-19 14:59 eb86dc67  d83_30.ic9
 2097152  Defl:N  1284093  39% 2017-02-19 14:59 912799f4  d83_01.ic40
 2097152  Defl:N  1144085  45% 2017-02-19 14:59 2abca020  d83_02.ic39
 2097152  Defl:N  1384375  34% 2017-02-19 14:59 1b2d9ec3  d83_03.ic18
     128  Defl:N       40  69% 2017-02-19 14:59 9f7368f4  eeprom-cbombers.bin
--------          -------  ---                            -------
32768128         11175663  66%                            30 files

Code
rene@marvin:~/src/qmc2> unzip -vl /home/games/mame/roms/thndzone.zip
Archive:  /home/games/mame/roms/thndzone.zip
 Length   Method    Size  Cmpr    Date    Time   CRC-32   Name
--------  ------  ------- ---- ---------- ----- --------  ----
  131072  Defl:N    24049  82% 2017-02-19 17:40 20250da6  gz01-1.a15
  131072  Defl:N    43540  67% 2017-02-19 17:40 3595fad0  gz03-1.a17
  131072  Defl:N    23294  82% 2017-02-19 17:40 b7277175  gt00.a14
  131072  Defl:N    35282  73% 2017-02-19 17:40 cde31e35  gt02.a16
  131072  Defl:N    30867  77% 2017-02-19 17:40 811d86d7  gz10-1.a12
  131072  Defl:N    61842  53% 2017-02-19 17:40 8f61ab1e  gz08-1.a9
  131072  Defl:N    12813  90% 2017-02-19 17:40 80cb23de  gt11-1.a14
  131072  Defl:N    50305  62% 2017-02-19 17:40 0a8fa7e1  gt09-1.a11
   65536  Defl:N    30378  54% 2017-02-19 17:40 81c29ebf  gt04.f18
   65536  Defl:N    32188  51% 2017-02-19 17:40 0aae996a  gt05.h11
   65536  Defl:N    30168  54% 2017-02-19 17:40 4efdf03d  gt06.h12
 1048576  Defl:N   486245  54% 2017-02-19 17:40 383bbc37  maj-02.h14
 1048576  Defl:N   545943  48% 2017-02-19 17:40 9840a204  maj-01.c18
 1048576  Defl:N   369268  65% 2017-02-19 17:40 87ea8d16  maj-00.c17
  524288  Defl:N   176428  66% 2017-02-19 17:40 36e49b19  maj-04.r1
  524288  Defl:N   184353  65% 2017-02-19 17:40 80fc71cc  maj-05.r2
  524288  Defl:N   188480  64% 2017-02-19 17:40 2e7a684b  maj-06.r3
  524288  Defl:N   194121  63% 2017-02-19 17:40 3acc1f78  maj-07.r5
  524288  Defl:N   132195  75% 2017-02-19 17:40 1958a36d  maj-08.s6
  524288  Defl:N   133723  75% 2017-02-19 17:40 c21087a1  maj-09.s8
  524288  Defl:N   151006  71% 2017-02-19 17:40 a02fa641  maj-10.s9
  524288  Defl:N   131600  75% 2017-02-19 17:40 dabe9305  maj-11.s11
  131072  Defl:N    65188  50% 2017-02-19 17:40 9a86a015  gt12.n1
  131072  Defl:N    56481  57% 2017-02-19 17:40 f4709905  gt13.n2
  131072  Defl:N    45842  65% 2017-02-19 17:40 750fc523  gt14.n3
  131072  Defl:N    31952  76% 2017-02-19 17:40 f14edd3d  gt15.n5
  131072  Defl:N   122417   7% 2017-02-19 17:40 750b7e5d  gt07.h15
  524288  Defl:N   436041  17% 2017-02-19 17:40 31dcfac3  maj-03.h16
    2048  Defl:N      260  87% 2017-02-19 17:40 bde780a2  mb7128y.10m
    2048  Defl:N     1299  37% 2017-02-19 17:40 c44d2751  mb7128y.16p
     260  Defl:N       41  84% 2017-02-19 17:40 199e83fd  pal16l8b.7d
--------          -------  ---                            -------
 9769220          3827609  61%                            31 files

Code
rene@marvin:~/src/qmc2> unzip -vl /home/games/mame/roms/topland.zip
Archive:  /home/games/mame/roms/topland.zip
 Length   Method    Size  Cmpr    Date    Time   CRC-32   Name
--------  ------  ------- ---- ---------- ----- --------  ----
  131072  Defl:N    28811  78% 2017-02-19 17:41 28264798  b62_41.43
  131072  Defl:N    52764  60% 2017-02-19 17:41 db872f7d  b62_40.14
  131072  Defl:N    35360  73% 2017-02-19 17:41 1bd53a72  b62_25.42
  131072  Defl:N    85839  35% 2017-02-19 17:41 845026c5  b62_24.13
  131072  Defl:N    30123  77% 2017-02-19 17:41 ef3a971c  b62_23.41
  131072  Defl:N    76547  42% 2017-02-19 17:41 94279201  b62_22.12
   65536  Defl:N    26442  60% 2017-02-19 17:41 389230e0  b62-42.34
    8192  Defl:N      972  88% 2017-02-19 17:41 5f38460d  b62-21.35
    8192  Defl:N     1491  82% 2017-02-19 17:41 a4afe958  b62-20.6
  131072  Defl:N    17825  86% 2017-02-19 17:41 38786867  b62-33.39
  131072  Defl:N    19196  85% 2017-02-19 17:41 4259e76a  b62-36.48
  131072  Defl:N    20112  85% 2017-02-19 17:41 efdd5c51  b62-29.27
  131072  Defl:N    20382  84% 2017-02-19 17:41 a7e10ca4  b62-34.40
  131072  Defl:N    20601  84% 2017-02-19 17:41 cba7bac5  b62-35.47
  131072  Defl:N    20131  85% 2017-02-19 17:41 30e37cb8  b62-30.28
  131072  Defl:N    19134  85% 2017-02-19 17:41 3feebfe3  b62-31.29
  131072  Defl:N    17784  86% 2017-02-19 17:41 66806646  b62-32.30
  131072  Defl:N    98418  25% 2017-02-19 17:41 36447066  b62-17.5
  131072  Defl:N   108292  17% 2017-02-19 17:41 203a5c27  b62-16.4
  131072  Defl:N   101427  23% 2017-02-19 17:41 e35ffe81  b62-15.3
  131072  Defl:N    96075  27% 2017-02-19 17:41 617948a3  b62-14.2
  131072  Defl:N    97761  25% 2017-02-19 17:41 b37dc3ea  b62-13.1
  131072  Defl:N   106197  19% 2017-02-19 17:41 3a4e687a  b62-18.31
    8192  Defl:N      838  90% 2017-02-19 17:41 c4be68a6  b62-28.22
     324  Defl:N       58  82% 2017-02-19 17:41 c43ab9d8  pal20l8b-b62-02.bin
     324  Defl:N       67  79% 2017-02-19 17:41 904753fa  pal20l8b-b62-03.bin
     324  Defl:N       79  76% 2017-02-19 17:41 80512abc  pal20l8b-b62-04.bin
     260  Defl:N       39  85% 2017-02-19 17:41 6c1e3fc4  pal16l8a-b62-10.bin
--------          -------  ---                            -------
 2712784          1102765  59%                            28 files

Is there anything in the collection rebuilder's log that would indicate a problem?

Also, does disabling "Add ZIP comment" change anything?

Last edited by qmc2; 02/26/17 05:32 PM.
A mind is like a parachute. It doesn't work unless it's open. [Frank Zappa]