Solution!
Thomas, I am sorry, but I couldn't stop thinking about why I the message was not triggered. Sometimes I am so blind (or is it because it's too late?!)... it's aweful.
Of course it was not a
project that always failed to load but a
workspace. Knowing this I was able to locate, why: In cbworkspace.cpp (cbWorkspace::Load()) this is not taken care of. I've filed a patch on sourceforge.net to fix this. If you have any time and don't know what else to do, please take a look at: SF.NET patch, ID 1386464. You may additionally look at ID 1382521, too (its' somehow related).
With best regards,
Morten.