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VI Freezes before For Loop

I have a VI that has a For Loop that I have parallelized to run quicker. The way I have this set up has been running successfully for a couple of months and I haven't made changes to it. In the past week or so when it gets to this For Loop it never enters it, it just freezes and hangs the whole program. I have attached a picture of the VI, any help would be great. 

Thanks

 

Screen Shot 2022-07-13 at 2.45.49 PM.png

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Execution highlighting is not supported for parallel FOR loops and it will just be skipped without highlighting. (You would need to enable debugging for the loop, which forces serial execution).

 

We need to assume that the contents of the FOR loop can actually run in parallel. You seem to be running Python nodes, so start reading here . What does your code actually do?

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