I don't have time to look at this properly until tomorrow.
In the meantime, could you just post the result of...

�� ��Delay delaySchedulerClass
it should be "DelayExperimentalSpinScheduler"�� ��***

Also could you try a few of the other options from
��World > System > Settings > System ...

***whoops, the Experimental tag should have been dropped for Pharo 5
Release.�� Its been fine for months (unless this is a fault :)�� ]

>
> Maybe it is wrong to keep and re-use same instance of Delay? (note it is
> outside the closure) (this was not a problem in the past).

Not sure.�� I've heard others say Delays should only be used once. To
experiment, could you try creating a delay each time.