Count formatting does not work well with very high numbers
If I have 1502083 gold, the result displayed is "502k".
I would expect either "1.5m" or, less helpfully, "1502k".
The leading digit is being truncated.
Also, under some circumstances, very incorrect numbers are reported, like "497k" for 1mil. I have no idea what triggers that. The fix is to do something like
Player->RemoveItem,"Gold_001",1000000000 to be completely sure it's zeroed out, then add back the proper amount.
When the numbers are badly wrong, it can make NPCs think you don't have enough money for what you're trying to buy; I experienced this in one interaction and was confused by it. I didn't notice the mis-match of actual gold versus displayed amount until much later, which is when I tried the gold removal and re-addition.
Setting this as "Reproducibility: Sometimes" since the wildly wrong numbers problem is not consistent, while the truncation one is; and I picked "OS: MacOS", since that's what I use, though a mechanics and GUI issue like may be cross-platform.
(RM-4346 from redmine: created on 2018-03-06 by Dark Locq, , closed on 2018-03-07 by Alexei Dobrohotov)