Refresh iforumpermission cache

[Jawelin]

Hi.
I tried to retrieve each usergroup permission on a given forum using the getpermission(forumid,0,groupid) function.
(it would be too complex doing that uprising the inheritance at database level ... as I tried to do days ago... :hurt: )

But noticed, cycling by the usergroup, a strange behavior based upon the order I tested the groups.
Analyzing the code, I realized there's a kind of cache of permission stored each time in global environment.

So, for example, if I test first usergroups 6 and 5, I get they CAN access to some forum. If I test them later, after some other groups, I get they CAN'T do the same access to the same forum.

Question is simple: how could I bypass this 'cache-due' strange and unpredictable behavior ?

Thank you very much.
Hope someone could give an answer.
Thanks