Alerts / Confirmation popping up

Hi all,

First of all thank you for this great forum.

Now, here me local system:
Joomla! 1.0.7
Community Builder Enhanced 0.622 Beta 1/2
Community Builder Enhanced Login 2.452 Plus
Simpelmachines 1.1 RC-2
Joomla! SMF-Bridge 1.1 RC-1
German-Pack 1.1 RC-2

Users are in sync between Joomla!/CBE and SMF.
Lifetime is the same.
Joomla!-SEF is on.

Logging in and out with CBE-Login and SMF-Login works.
But there is a little annoying issue about login, perhaps no big thing for you gurus but I didn't find a solution at this forum yet.

When logging in there will popup up:
1. An alert popup, that username and password have to be filled out
2. A confirmation popup, that POST-data tried to be loaded that were gone in Cache ...
3. A further alert like at 1.

Does anyone knows a solution for that little issue, or what I did the wrong way?

Aside this all seems to work fine. Cool

Thank you in advance.

Greeting
Frank

PS: Sorry for my bad English.