Version:           2.9.999 (using 4.0.3 (KDE 4.0.3), Kubuntu packages)
Compiler:          gcc
OS:                Linux (i686) release 2.6.24-17-generic

Ark fails to extract any files from ZIP files that the UNZIP command extracts just fine. If I select a file before clicking extract, it reports e.g. "Could not locate file COMIC.EXE in the archive." If I try to extract with no file selected, it gives no error message but creates no files. It doesn't seem to make a difference whether I try to unzip to an existing folder or one that Ark would have to create.