I guess I'm a little late to the topic, but I installed CM11 on my nook color and my razr HD. After reading this thread, I uninstalled xposed from both devices.
Every time I change from Dalvik to Art, the boot process takes long, apps getting modified, and once it's all done and I check developer options, it's telling me that it runs Dalvik.
Is there a way to pinpoint which apps could cause this?
Would it be sufficient to remove all apps and then install one app after the other to see if Art is still running, or would I have to reinstall Android or at least wipe all user data?