We edited the built in XOR file and put it in the BuiltInChips folder. The HDL will revert to the original blank chip.
And therein lies your problem. Why did you put it in the BuiltInChips folder instead of leaving it in the projects\01 folder where it belongs?
Do you still have the original Xor.hdl file in your project\01 directory?
Don't mess with the BuiltInChips folder. That folder contains implementations that invoke the simulators built-in models, but ONLY when there is no corresponding file in the folder that the simulator is running on. When there IS a file in the folder being used, the simulator ONLY looks at the contents of THAT file.