Hi Korgi
There are no temporary fixes on this issue. The access flag bit for sending group notices is '4398046511104' (= bit no. 42), the one for receiving group notices '8796093022208' (= bit no. 43). Most group access flags are up there, far above 32.
If you look at your jOpenSim Admin overview, it will most probably tell you on the right side about "OS Info: running on 32Bit System", that means your server can not handle bit flag operations above 32 and therefor it will not work on this server (I intentially added this info for exactly this reason).
This isnt a limitation of jOpenSim but from OpenSim. But even if I would be part of their team, I would not be able to have a solution here except changing server. There are so many access level issues to handle, by far more than 32 ... some must be above this limit.
Greetz
FoTo50