Quote Originally Posted by HenrikOlsson View Post
Does that short piece of code (with different CONFIG of course) really compile for the 18F4550 but not for 18F14K50?

There really isn't much actual code there is it?
I see no USBINIT or anything so it might be that the USB libraries aren't included by PBP during compile time and therefor the variables that the assembler is looking for isn't being declared.
Yes, it compiles for the 18F4550 even without the config lines.