Made this a support ticket because i wasn't sure if it reflects a more general problem.
hmm, my guess is the issue is that it's depluralizing matthias to matthia, and then depluralizing matthia to matthium or something.
workaround is probably to change his name to "M autrata", invite, change back... ?
--Ethan McCutchen.....Tue Jun 08 12:27:31 -0700 2010