I recently upgrdaded cbb from 1.13 to 1.15 using XOOPS 2.0.13.2 and php version: 4.4.1

I've in home page a block with most recent posts from forum...if I try to change some preferences from Admin -> blocks -> most recent topics I don't have any errors (also activing php debug) but some parameters don't change!
For example "time period" is setted to 1 and I cant't change that number! If I try to change "Allowed forum list" I can select the right forum but when I submit changes they aren't registered!
I also tried to upgrade cbb module and when I do so I obtain the original value before module's upgrading.

Is it possible to downgrade to 1.14 or 1.13? Or better is there a solution?

Tnx