Note: I had originally reported #60 in this issue but have now moved it to its own issue.

Arduino IDE 1.6.7 2011年11月10日 12:55 with Windows 7 64 bit:
When compiling, the Library can't use both 'src' and 'utility' folders. error doesn't specify which library is causing the problem. This error breaks all compilation so the library causing it must be fixed before the IDE can be used.

Edit: I just discovered that if you open Library Manager or Boards Manager the error does state which library is causing the error.