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yes, I have diagnosed the issue and have a workaround.

Only seems to occur on racks with the AES option.

It occurs when you load a show file that was created on 1.83 firmware.
If you resave the file in 1.9 format then reload it, the issue does not occur.

I have replicated using multiple 1.83 show files eliminating the possibility of a corrupt file.

It appears, if the power is lost on an IDR with a 1.83 show loaded and you have the AES option installed, the Output assignments are reset to default when the power is restored.