​ In the marketing pop-up museum, entering a negative balance caused most positive cashflow to turn negative. NOT all of it, but I can confirm that sales of items and rooms, donation collection, and loans all turned negative. I'm hesitant to try to reproduce the bug because there's no such thing as a save/restore, which makes the entire thing (as well as the pop-up setup) extremely frustrating.

 Incident began on patch 1.2.178275, but persists in existing save after latest hotfix.

Edit: it's triggered by losses on earnings reports, NOT the total balance.  I was 400k positive, got an earnings report of -5k, and suddenly my balance is -395k.  It did the math right but is counting the whole thing as negative.  It flips back with any positive earnings report.  I think something somewhere is adding an extra negative in the earnings report stage, and possibly other times when tabulations are occurring.  The values the game is tracking seem to be unaffected.

Workaround: wait until a positive earnings report is generated.  It seems safe to collect donations and sell items in the meantime, they'll just bounce back.  If it's an emergency or you're losing money, take out a loan and it'll push it back up.

Game files at: https://drive.google.com/file/d/1X3DlwjEjyeQK2Jbo8HM04qm8SAzfU6Vv/view?usp=drive_link