FC4: out of memory errors?

[Edwin Olson]

On a fresh install of FC4, on a machine which had been running FC4T3 
without issues, I'm encountering odd "out of memory" errors.

One moment, running a command (launching one of my own java 
applications, or playing a movie in mplayer) will work; the next moment, 
I get an out of memory error, or a X-related insufficient resources. My 
apologies, I don't recall the exact error message.

I will attempt to characterize the problem tomorrow, but I thought I'd 
share my experiences in case anyone else is having these sorts of issues.

I am using the nvidia drivers, which might be a factor. My java app uses 
OpenGL, and mplayer does some videocard acceleration, doesn't it?

-Ed