#'_decompressZipArchive' was sent but not implemented ... and I assume that the selector was renamed somewhere in 3.4 timeframe ... GLASS has been patched to ignore the missing selector because the code does a #respondsTo: so at this point finding the replacement method for #'_decompressZipArchive' is an performance issue (GLASS1 may already properly patched) ... 3.5 and 3.4 issue