Interesting follow-up:

I tried using the following code:

TimeRange.ClearContents
AltRange.ClearContents

...placed after the series collection definitions. The chart was stil
redrawn several times before stopping with the same error, but the lin
was only drawn once and then the chart was cleared and left blank i
subsequent redraws. So I'm positive that there is some kind of loopin
effect, I just don't understand what could be causing it

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