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Probe change madness!!!

my program has 3 probes.

when calibrating the probes i highlight them, execute block, mark used, measure, etc...

all works well for the first 2 probes. they load and qualify as they should.

when i try to load the 3rd probe i get the following error cond:



in the program if i switch the 3rd probe with the 1st probe, and then try to execute the block, it still gives me the same error cond.

it just worked mere minutes before...

i've done the usual reboot, remove the line and replace it, try different probes etc...

thoughts??