I have upgraded Xcode to the latest Version 7.2.1 (7C1002) as of 2/8/2016, and now my project won't compile, with the following error: 'IG/IG.h' file not found. The code has been working well previously. To double check, I tried compiling the SampleBrowser demo project, and got the same error (also working fine prior to latest upgrade). I've removed the libraries, re-added them. I tried explicitly adding the full IG.h path to no avail.
I've submitted a ticket, but wonder if anyone else is having the same problem. Thanks.
I solved it - apparently the latest Xcode upgrade cleared my user header search path and framework search path, and I only restored the framework search path.