hello,

I had trouble very similar to yours after upgrading my image from 5987 
to 6351(same errors about resumptionTime, actually coming from a nil 
value in Delay class var SuspendedDelays).

all this went away after I did

Delay startTimerInterruptWatcher

... does this changes anything in your case ?


regards,

Stef



Bernhard Pieber wrote:
> 
> Sometimes, not always I am afraid, my image freezes. There are three
> scenarios for that:
> - Either I get Error: Attempt to evaluate a block that is already being
> evaluated. See Attempt to evaluate.log.
> - Or I get MessageNotUnderstood: UndefinedObject>>resumptionTime. See
> resumptionTime.log.
> - Or it just freezes without a new debugger.
> 
> One more thing:
> It looks to me that it might be so difficult to reproduce because there
> are some timing issues. In some of my tests I waited some tens of
> seconds between some of the steps and got the freeze.