This didn’t seem to affect tracing or anything. Just strange. I was using Chrome.
Ooooh. That’s a fun one. Let us know if you (or anyone else) see it again.
Here’s some more fun for you!
The ghost cube has been there since J-Day, several players commenting per day. I started in Safari and never saw it. I switched to Chrome and see it in every play. I run a 6 year old iMac with OSX 10.7. Hope this helps.