I have seen this too, running on a Retina MBP, fully up-to-date Mountain Lion. I find that clicking the program icon in the dock is generally enough to make the missing window appear.
One other Window-related problem - and I haven't confirmed this in 13.03 yet - but on the pre-release version at least, it was possible to end up with the main window totally off screen and no way to get it back short of hacking the ini file to set the window coordinates to something sane. This was related to having Cura running on a second monitor, and then unplugging it. I've had the window be totally off screen (on the no-longer connected monitor - so in theory I could fix that by plugging the monitor back in, if I was still near it) or on my main screen, but with its top off screen so there was no way to drag it back on screen. The position persists across restarts, so that once it gets into the latter mode, the only solution is the hack the ini file in ~/.cura.
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Daid 306
We've noticed the same on some Macs. I've yet to establish the cause. It didn't happen on our test machines strangely enough.
Btw, which version of MacOS do you run on?
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