Had to withdraw PMR ! Could not reproduce it consistently any longer :-(
It sounds as bad news, but its not.
I might have had some Debug sessions
over e period of hot-restarts of my Win7 Designer client, so I guess I
came across the kind of 'memory leak' problem that shows by completely
never seen and weird errors.
After I filed the PMR, I was asked to
deliver a sample to re-produce the symptoms, which is fair, but I could
no longer !
The good news is, that the intended
code for @Evaluation formulas can be made as one hoped for.