Last modified: 2008-09-08 20:33:24 UTC
In a situation in which there are additional rights (e.g. adding additional protection levels) the extension is unable to find those rights.
The restriction levels are a b and c.
If c is a custom restriction level, then you can't assign the right c to any group.
fixed in r37266 (version 0.5.1).
You'll need to make a dummy edit on Special:Configure and purge diff cache (if enabled) by calling diffs with action=purge.
damn, this is the wrong bug, the fix was for bug 14742.
fixed in r40613 (version 0.7.3).
This fix requires MediaWiki 1.13+ to work.