Why is xCode 4.3 syntax highlighting broken into some 64-bit projects?

Question

I use Xcode in many 64-bit projects, no problem ... But many times I found that when the target is configured for 64-bit, the all-but-basic code completion and syntax highlighting stop working, This is the case turned on whether ARC - or not .. (and yes, I know that a 32-bit invalid target in ARC is blah blah blah ... but the funny thing is: syntax highlighting usually works on such an incorrect violation if the project switches to 32 bit mode. I tried to remove the Derivative Data, clear, analyze, etc. See problem illustration below s. It's on 10.7.3, 12GB RAM, 8-Core 2008 MacPro.

You know what I'm talking about, if at the top, you see Xcode talking

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Any ideas?

Answer 1

I can confirm, after several tests, that goint in Product -> Edit Scheme -> and then Toggle Either / Or Peristent State / Document Versions Installs this.