switching build target from OSX to iOS causes render camera to render white

I have a project where I've set up a rendering camera in order to reduce the size of textures coming in from www.image. This works perfectly for Windows PC and OSX targets, but when I switch to iOS, it renders white. The strange thing, is that it seems at least one time I was able to build successfully for iOS and the rendering worked as expected.

I'm using Unity Pro, version 4.1.5, and Xcode version 4.6.3 (4H1503) all on OSX Lion 10.7.5 with latest updates.

My setup:

Mac OS X Lion 10.7.5 (11G63b)
Model Name: MacBook Pro
Model Identifier: MacBookPro4,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.5 GHz
Number of Processors: 1
Total Number of Cores: 2
L2 Cache: 6 MB
Memory: 4 GB
Bus Speed: 800 MHz
Boot ROM Version: MBP41.00C1.B03
SMC Version (system): 1.28f3


The strange thing is my coworker has exactly the same versions of software, and for the same code he can switch back and forth with no rendering problems.

His setup:

Mac OS X Lion 10.7.5 (11G63b)
Model Name: MacBook Air
Model Identifier: MacBookAir4,1
Processor Name: Intel Core i7
Processor Speed: 1.8 GHz
Number of Processors: 1
Total Number of Cores: 2
L2 Cache (per Core): 256 KB
L3 Cache: 4 MB
Memory: 4 GB
Boot ROM Version: MBA41.0077.B0F
SMC Version (system): 1.74f4


Note that I don't have the iOS Pro license.

 

Is rendering on iOS a Unity Pro feature?