[Cin] Adding 'brightness/contrast' effect on track while playing can freeze Cin-GG?

[Phyllis Smith]

UPDATE:  the UNDO (I think while playing) is not working yet.  If you build
and test, be advised that UNDO has to be fixed.

> A fix has been checked into the GIT repository.  More rework of the
> infinite problem of locking issues when multiple operations are queued up.
> I have added this problem as part of MantisBT #135 so they are related.
> gg/Phyllis
>
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