[Owncloud] Login impossible since update from 4.0.6 to 4.5beta2

[auipga]

Hi there,

a few days ago I updated my ownCloud from version 4.0.6 to 4.5beta2. Since
then I can't login anymore, regardless which account I use.
I'm using MySQL and all users in the table are still there. No message
appears when I'm trying to login.
User folders are still there too.

Unfortunately the apache log cannot be provided.

Regards
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