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I think that is the point he is trying to make though (based on the title of the thread); that LabVIEW should let us specify which plot we are working on when setting a property without it being overruled by what is done elsewhere as long as that is not actually on the same plot. If e.g. you have one location where you want to set the property of plot 2 and you also have some code in parallel working on a a property of plot 4 they should be able to declare/access the separate plots *without the risk of a race condition*. I agree with @infinitenothing, it is a bad design (I have not checked if anyone has already asked for a change of that in the idea exchange though. It would be a good idea to post there.)

Well you have a clear race condition here when setting the "ActPlot" property in two parallel running loops, so I do not see how the behavior you describe is a surprise. It is working completely as one should expect.

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