After changing a plugin's version in the Introjucer, building in Xcode does not rebuild the ".rsrc" files. Then the plugin fails auval with something like:
ERROR: Component Version mismatch: Res Vers = 0x10205, Comp Vers = 0x10206
Looks like an Xcode bug, and I suggest an Introjucer workaround to delete the ".rsrc" files in the build folder when exporting the Xcode project: https://github.com/soundradix/JUCE/commit/26e5abb7f12fbf850e2beffd80f44390502364e2
Cheers, Yair