Hi Pete.
As far as I know, AOO can't lock up the DLLs. Does AOO use NSPR? NSPR is actually a (well was) Netscape bit, which is used by a few things.
You can try going into ANPM and under Manage, there is Yum Tools which has a way to cleanup and rebuild the RPM data base. You can try those steps and see if it helps.
There may be other resources besides shared memory that is running out, I don't know. Generally what happens here after a day or two running SM, TB and occasionally FF is the system locks up or spontaneously reboots. The mozturbo programs seem to have fixed that.