I'm not knocking Addon Studio at all, I used v1.0 a lot and am excited to see
v2.0 progress, but recently I found another alternative.
While we wait for
Addon Studio v2.0, Check out
WOW UI Designer, it seems very stable & has some nice features more dedicated to WoW, like the actual project file is the Toc file, simple. handles custom frames nicely too.
For more check out
its own forum here at WoWinterface.