[APBeta] Sky tab crashing

[Paul Rodman]

A number of you (mostly, or all, Mac users for a change) have reported a hard crash when selecting the Sky tab. Although I can't reproduce this myself, the crash reports you sent (thanks) are indicating a nasty thread interaction. I suspect I know what is going on, and how to resolve this, but it will take a bit of code juggling.

Just so you know I'm still alive, and still have a few hairs left on my head.

Paul R.