First off, Precious Stones is by far the best darn plugin around!

However i have been having some issues.
After the server has been running for a few hours sometimes players are suddenly unable to call /ps visualise
and are unable to place special blocks to create zones. (No permissions?
Zones that have been place previously are still there and can be checked with /ps info, but no new ones can be created.

I have had no choice but to restart my server to fix this issue.

If anyone else is having this issue or has some pointers for me please leave comment.

This is possibly my own fault in not configuring groupmanager well. I seem to have improved results by not using global groups. Hope this helps someone.