hog II error upon load

been called in tonight to help save a dance night. operator loaded previously used showdisk into HogII, got this error:
"
can't read file: \zcat.dat
"
and the console asked to try another disk. accidentally hitting the V instead of X, the same error appeared, but was extended:
"
can't read file: \zcat.dat\hog2\build\diskman.cpp($revision:80$)(2389)TNT v3.3(177): internal error-not clean
"
Obviously the disk got corrupted, but I can't check where it's been, and the operator claims no weird things have happened to it.
loading my own normal showdisk gives me (at first glance) exactly what I always get: my normal set-up on a rock solid console.
the situation: concert venue, several freelance operators working shows, al started their showdisks from a patch me and my colleague made.
any info'd be appreciated...
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