Well, if it works perfectly for you, *I* must be lying, and deserve and eyeroll. I must have bothered to create an account just to log into this forum and make up false bug reports.

No, really truly, I still experience this bug. As we speak.
• I am on Snow Leopard. 10.8.6
• I am on Yummy 1.8.7
• I have quit and re-launched Yummy many-a-time
• I have rebooted many-a-time
• Always, consitently, since this problem popped up — I can not access any Yummy windows when using my laptop alone; I can only access them when connected to an external monitor — they sit there on the external monitor.
I noticed this problem over a month ago, and it has persisted though updates and many reboots and relaunches.
I'm moving to a new laptop and Lion in a day or so, which may cure the problem by chance. But the problem definitely still exists with my particular setup.