Wow this is really old! as old as woot's eyebrows!!
Starcraft was created to only have up to a 5 digit min/gas count.
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6, for mine at least, it didn't go away until it reached 1 million, and that's 7 digits.
And I did a quick trigger in SCXE for this so I could only put the add minerals to 32 thousand whatever, so sometimes while it was adding them over 1 million it would flash on and off, like sometimes the number characters fit and other times they didn't.