I am getting the same problem, unable to open a document. this doesn't happen if OO is the first app I use after booting up my PC, only after running other apps, which could be anything. Checking running processes soffice is running and using over 80% of cpu time and I have to kill this process, although this doesn't improve the situation. The only way to get OO to work is to reboot.
I have completely remove OO and installed again using getopenoffice without success.
The latest java runtime is installed and set in OO options and my system is up to date. I am running a PCLOS2010 KDE with LXDE desktop.