I've never heard of this, and don't know what FIIfexp might mean. There wasn't much change between 006 and 007 -- certainly not to DFORRT.dll or ifeffit_10.dll, so it seems pretty strange. It does appear that the DFORRT.dll in ifeffit/sixpack/ is older than the one in ifeffit/. I'd be surprised if that had an affect, but it's easy enough to try both versions of the dll. There's also a MSVCRT.dll that you could try moving away, so that the system one gets used.
Does this problem happen with ifeffit.bat? One thing that did change between 006 and 007 was that the perl-generated executables got smaller by a factor of 2. This might suggest that the perl codes depend more heavily on other dlls for code, but I don't know any of the details...
--Matt
Well, after some more investigation, I can get the upgrades to work on just about every other computer on site except for mine. The .bats all look fine, as near as I can tell. As you suggested Matt, it only appears that the perl codes -- the ones that depend on IFEFFIT are problematic. The rest (such as ifeffit.bat and sixpack) seem fine. Even uninstalling everything and reinstalling doesn't seem to help at all. I guess I'll manage with the old versions for now. Thanks all! Sam