Photobooth issue

OK this doesn't really affect me, but would be nice to get working. This is the sam issue after a fresh install as well as standard checks- dick utility permissions etc. When I do the 'four photos in one' thing, it just takes a black picture:

The four pics show up in the thumbnail but not in the big thing (as above) nor in the actual jpeg at the root source.

Whilst Im at it, the little heart and flying birds effects for iChat and photo booth (new to Lion) seem to have black boxes round them- almost like there's something wrong with the original picture (I think it's like a gif made with quartz or somehting?
-Hoping its something I can do by just altering a file somewhere to correct it...

Again, this has happened twice, even with a fresh install, so please don't make reinstalling your first suggestion :)

:D
Tom Morter-Laing
Freelance Editor,
Certified Apple Product Proffessional, 2010
http://www.depictproductions.co.uk

Sony Z5, with Rode NTG2.
iMac 27" intel i7 2.93GHz, 12GB RAM, ATI HD5750 [1GB GDDR5], 2TB Int. SATA with 2TB External HDD; (FW800), with Elgato Turbo H264HD.