We just launched a new update with some bug fixes for the 4.3 version. Just select the option Help -> Check for updates inside your Prototyper to update to this version.
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Every time I open Prototyper, it says there is a new version and then says it cannot connect to the servers. So I use Help --> Check for Updates. Then it says it needs to restart Prototyper. Rinse and Repeat. Is there some way to break the loop?
Version (Ver. 4.3.1)
Mac OS X Version 10.6.8
2.66 ghz Intel core 2 duo
4GB 1067 mhz DDR3