Quote Originally Posted by Ioannis View Post
Have done some test a while back on Timers 0 and 1 on 1939 chip and all went just fine.

Ioannis
Ok, well that's promising cause it also has the enhanced 16bit timer1.
https://ww1.microchip.com/downloads/.../40001574C.pdf

I even made sure to put the INCLUDES in the exact same order, but the error persists.

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It's either something totally obvious, or painfully obscure.