> Somewhere in the ISR, it "locks up"

Do you mean PC never returns to the main loop ? Have you
tried the LED test outside the ISR ? It looks as though you're
getting a 1ppm signal from somewhere and using to increment
the minute counter. Have you checked that signal ?

>     btfsc   STATUS,C ;Has 60 minutes passed?
>     goto    hours    ;Yes
>     goto    day  ;No, but we need to see how many hours have passed.

You could knock out an instruction here

btfss status,c
goto day

hours

>   btfsc   incdec,0  ;No, determine if we increase/decrease brightness
>   goto    lights    ;Increase brightness
>   goto    dark      ;Decrease brightness

and here

btfss incdec,w
goto dark

lights

> As always, I would greatly appreciate any insight into my apparent
> loss of marbles...

Have they rolled under the desk ?

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