Libraries get "forgotten" although still in list

One thing I've noticed is that I can get into a state where my library
settings somehow get "forgotten" even though they are still there in the
list. For example I am writing Servlets and of course I have to add
"servlet.jar" into my list of libs. This works fine until I restart
IDEA and notice that classes HttpServletRequest are all red and the
import javax.servlet.http.* has a red line under the servlet part. This
also happens with XML libraries I import.

I have this problem whether I use module, project or global libraries.
I have this problem in every build from 977 onwards. I am running on
Red Hat 9.

Anyone else seen this or is it just me (again)?

Thanks,

Nick.

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