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i made a typo mgroup should be 4 not 3.
you should not have uninstalled the module until every possibility had been tried. sorry for my error, but patience is needed as i hadn't seen your post till now and the fact i haven't been on here today yet, i would not have known that the solution i gave you didn't work.. also uninstalling the module would not have lost you the members, only the posts and topics etc.
as for searching on bbpixel.
http://forum.bbpixel.com/index.php?showtopic=1321
http://forum.bbpixel.com/index.php?showtopic=1610
http://forum.bbpixel.com/index.php?showtopic=1924
http://forum.bbpixel.com/index.php?showtopic=2145
thats 4 topics out of 2 pages i got using the search feature for admin login problem and keywords of mgroup