I have been experiencing the wierd cursor jumping issue for past week since I moved the files to dropbox. This can be seen running with Xcode 6.4 too. I also got even more strange issue in that every time I make some change in the playground, the ios Simulator would pop up with the App named <the playground file> and would try to run the App. Moved the playground file to local disk and everything is fine. Thanks for your suggestion.
Topic:
Developer Tools & Services
SubTopic:
Xcode
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