Sometimes when a user switches world the group name go to a capital. So if their group name is testgroup it changes to Testgroup which doesn't exist. This only happens 1 out of 10 times switching worlds but is still very annoying.
Try putting this on the PermissionsBukkit page? Or contacting the author directly? I just doubt how effective a post here could be.
Tried doing that. No one has replied. Also mutli world permissions don't work right. You always keep the same permissions until the config is reloaded
I just found out. His github source is updated but the downloads aren't. So I just complied the github source and it works fine.