[Typo3] Bug in backend usergroup 'Tables(modify)'?

[Albert van der Veen]

Hello list,

I'm experiencing some odd behaviour when trying to change the 
'Tables(modify)' section for a particular BE usergroup: it's impossible to 
select more then 20 tables. If I select more, the last (execeeding the 20 
limit) will be deselected when I save the record. Is this a bug or am I 
overlooking something obvious?

thanks,
Albert van der Veen