Happens on Vista on my comp.
I managed to reproduce the totally blank preview on my XP machine, and I think I've fixed it for next build... not that confident though. Let me know if you still have problems after the next release.
Same thing for me :(
Windows XP SP3
ATI Radeon HD4850 1GB
To all affected: is this fixed in r54 now?
For me it works now.
I still got the background flickering when moving the preview window around (idc), but the important part is that the preview displays correctly in the window.
Good fix.
Preview working perfectly here on XP SP3.
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Working here too on vista!
Phew! Glad to hear!