Viewing a history listing
Special:MessageGroupStats works bit strangely. When used by format "Special:MessageGroupStats/id" it shows the right statistics but Message Group indicator shows "Translatewiki.net" (group wiki-betawiki). Consequently, after (de)marking some option for (not) showing statistics for fully / none translated languages, it shows statistics for Translatewiki.net, instead of the expected group. The URL than is "Special:MessageGroupStats/id?group=wiki-betawiki&x=D".
It created problem in Template:Project subtitle but I am now solving it. I suppose that the previously used format worked before and than some software change occured which introduced this bug.