So after I create an Xcode 6 project, even if I haven\'t written any code in it, if I try renaming it by double clicking the bolded program title in the upper left hand corn
Ran into this too, after copying and renaming the folder with an xcode project. I think it's a bug in xcode. Best file a bug with bugreporter (https://bugreport.apple.com/). Removing the test target from my project fixed it for me, too.
There are different places where you should check for the rename. You should check for the "old" project name in the test target and in the project target. Search for the old name string and rename them manually to the new name.