Weather Radar White Screen
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Seems like this happens when you first turn it on, go to Test, then back to Standby. It will clear and not happen again as soon as you go into Operate.
Once you turn the unit off, you can make it happen again by going from Standby to Test and back without going into Operate.
EDIT: or at least I thought. I can definitely duplicate it repeatedly by powering the unit off, then into Standby, waiting for the self test to complete, going into Test, then back into Standby. Happens at least once per power cycle.
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Unfortunately, this doesn't seem to be anything I can reproduce from here. Is this MSFS 2024? The shape of the white area tells me that it probably has to do with MSFS's weather radar "feed", and not something obvious on my end. I'll keep my eye out for it.