Hi, I think i finally found the problem. It seems that the serialize classes can not be used in parallell frpm two threads even if they are diferent objects. WHen I added semaphores around them the problem disapperaed. 
I will try to reproduce the problem in a small program and file a report.
However, I am struggeling with converting to SCOOP instead and it will peobqably take some time until I can make take care of this problem again.

REgards

Anders