My old name consisted of a camel case type name similar to this
MyApp
I then changed it to
Myapp \'notice the A is
I had a similar issue, but it only affected a Target that got affixed with "case-insensitive-rename". If you have a similar situation, just do the following (using XCode 5):
1) click on your project in the left. 2) expand to see all your targets by clicking the tiny button
3) rename affected Target(s).
4) Save project. Then for OCD brownie points, open your project in a text editor and do a ctrl-f for any "insensitive" or similar to ensure everything's resolved.