The demo version of Prizmo currently has a bug which saves the second and all subsequent saves as a blank white file until the app is quit and relaunched. This screencast shows what I do to achieve this. I am using a Jul-2006 MacBook Pro 2.16Ghz Intel Core Duo, 2GB 667Mhz DDR2 SDRAM, Mac OS X 10.5.7, Safari 4 Beta 5528.17.

Prizmo 1.0.1.d2 - Blank 2nd Save from Neil Boyd on Vimeo.