As a rule, applications do not run in isolation: they may need to access other packages in order to perform certain tasks. The first are said to be "dependent" on the latter. When some or all of their dependencies are unmet (=missing), your applications will either refuse to run or at least miss some functionality.
My estimate: it is a dependency issue indeed. I did get a warning that the software contained an unknown statement. I wonder, however, whether it's not simply a lost cause. I noticed that avast anti-virus database dates back to July 2006 - in other words, it would appear that avast is simply not up to date with the latest Linux libraries. Or someone has simply done some careless coding. It wouldn't be the first time that a third party application contained some serious programming error.
Anyway, I switched to Clamav. It looks like something from the eighties (but so does avast for Linux if you ask me) but the main thing is that it's running fine.
Last edited by jay73; 05-15-2007 at 12:18 PM.