White screen on iOS simulator with Xcode 7.0.1 (Swift) -


after upgrading xcode 7.0.1, can run old apps without problems (after updating swift syntax), new apps try build invariably freeze launch screen on attempts build , run on simulator or device.

i can make changes storyboard want, create code linkages button, textfield, etc, nothing launch screen when build & run.

there no compiler errors, no warnings, nothing give me hint of heck going on. i've cleared derived data, clean & build, reset content & settings, & removed/reinstalled xcode without luck.

does have idea what's going on here, or can tell me can start digging find issue? i'd post screen shot if there post, i've got nothing.

i'm running yosemite 10.10.5 xcode 7.0.1 swift


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