We've merged a bunch of threads reporting this issue together. It would be good to try and come up with the steps leading to this.
For those experiencing it:
- Is your issue affecting just walls, just wallpapers or both?
- Which specific lots is this happening on? Could you list them?
- When it happens is there anything unusual about the appearance of the lot in the map view? Is it a slightly different colour to the rest of the lots or just looks a bit off?
- Can you remember what you were specifically doing before it happened? Was there a sim on the lot or were you just building? Had you just flicked from live mode into build mode? Had you been using a specific build tool at the time?
- Are you using any Mods that may alter the behaviour of the Maxis build tools or add additional functionality?
