Like we all know, WCG must be manually attached to as it can't be controlled using BAM. It has worked fine though, I have connected and controlled all other projects via BAM and WCG manually.

Now for the last days however I have noticed that WCG gets detached. I tried re-attaching, but at some point all computers have detached again and my CPU's are running idle.

29.11.2010 12:23:47 Contacting account manager at http://bam.boincstats.com/
29.11.2010 12:23:49 Account manager: BAM! User-ID: 63183
29.11.2010 12:23:49 Account manager: BAM! Host-ID: 242909
29.11.2010 12:23:49 Account manager: Number of BAM! connections for this host: 287
29.11.2010 12:23:49 Account manager: Dear founder of team Universe Examiners:
29.11.2010 12:23:49 Account manager: You are invited to participate in the new challenge section on BOINCstats: http://boincstats.com/bam/challenge.php
29.11.2010 12:23:49 Account manager contact succeeded
29.11.2010 12:23:49 World Community Grid Resetting project
29.11.2010 12:23:50 World Community Grid Detaching from project

Why is this happening all the sudden and how can I continue crunching WCG?

Have you tried adding your WCG account to BAM lately? WCG does work with BAM, although it's pretty temperamental.

Count me in,
and I lost the done calculation from 4 machines.
one sample:
28.11.2010 13:48:58 Contacting account manager at http://bam.boincstats.com/
28.11.2010 13:49:00 Account manager: BAM! User-ID: 84544
28.11.2010 13:49:00 Account manager: BAM! Host-ID: 221995
28.11.2010 13:49:00 Account manager: Number of BAM! connections for this host: 765
28.11.2010 13:49:00 Account manager contact succeeded
28.11.2010 13:49:00 World Community Grid Resetting project
28.11.2010 13:49:01 World Community Grid Detaching from project

I hope that these posts are also being made at WCG?
Since they've chosen to use non-standard Boinc software that doesn't work properly with BAM, It's actually their fault and they should be made aware of it.
Maybe if enough users who get detached like this were to stay detached, then WCG might just do something about it.

I actually got this to work with the hint from noderaser. I first had to change my account name and then try to "Find account" unden project sign-up and it actually found it and now WCG works with BAM! So it works even though BAM says it has no contact with WCG.

I still suspect that joining to WCG does not work with BAM, but as long as you have the same username and password, you can find your WCG account and join it to BAM.

But nevertheless, this is new "functionality" by BAM, since for the last two years BAM did NOT disconnect WCG even though it was not under BAM control. So something has changed...

Some have tried bringing it up at WCG, but their excuse is that since there is no published standard, they are not doing anything wrong--even though they are the only project that's having such difficulties.

I looked at TS BAM! log and it looks like WCG is attached (via BAM!) and BAM! is not sending a detach command. Seems the problem is solved.