Dagoth, I was referred to you and this thread, although this bugs are from version 1.29.4.6 beta, not 1.30.
1. When I try to buy 6. brothel game doesn't ask number of businesses I own, it only says (25000 gp - 50 rooms). However, clicking buy option doesn't buy it.
2. This is a "positive" bug: infinite money, however I don't like cheating.... When I try to sell back items to shop, I get money, but my items stay with me (multiple quantity of an item). Happened a couple of times. I think it may have something to do with positioning of the player and shop: it happened when I put shop inventory on the left side of the screen and player inventory on the right side.