Yes, unfortunately the variables don't show when simulating directly in ISIS.
But if you run Proteus as a debugger in MPLAB 8 the watch window will show the variables.
MPLAB uses the same .cof file, so it's not currently known why they work in MPLAB and not ISIS.
Since you can have as many serial lcd's or virtual terminals as you want, it easier to just put a few statements in your program to spit out the variables at key points.
I don't really miss the variable window too much.
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