[Plugin: LeagueManager] Updating results won't work, suddenly

I’ve updated to WordPress 3.1 and LeagueManager plugin to version 3.7 and suddenly, I can’t update match results anymore when i click “update results” button on particular league. Nothing happens, not even an error.
In this example, I’m having for about 200 matches, and half of them (until now) were successfully updated until now.

Does anyone have similar issues? any ideas? thanks in advance