So here's a strange one.
The .15 firmware update messed up my professional calibration as I was afraid it might -- different picture with the same settings. But it did not mess it up permanently...
I applied the update last evening. When the TV restarted, I immediately noticed that the picture was not the same, on the same source with the same content. It was noticeably brighter, in a bad way -- picture lost its sense of depth and looked a bit washed out. There was also noticeable edge enhancement, as though the sharpness was turned up, even though it was set to 0.
My awesome (even on SDR content) Chad B picture looked more like an LCD
This was on ISF Bright and Dark.
I tried cold-booting it twice, by turning it off and then unplugging it for about 20 seconds. The second time, I held in the power switch on the back (to drain the capacitors) while it was unplugged. This did not help.
Very oddly, both times I plugged it back in, the TV turned itself on right away! I thought "What the heck, if we have a temporary power failure while I am not home, will I come home to the TV being on?"
Some experimentation revealed that if I turned the Contrast from the usual 85 down to 81 or so, the picture recovered a lot of its pleasing naturalness and saturation, but at the cost of the loss of some black details.
I gave up at that point and just watched TV for the evening, figuring that I'd use a calibration disc today to poke at it.
First thing today, after the TV had been turned off but plugged in all night, I unplugged it again. This time I left it unplugged for 15 - 20 minutes. When I plugged it back in, it did NOT turn itself back on like it was doing last night. Hmmmmmm....
And when I turned it on with the remote, it was back to normal again, looks great now with the Contrast at 85.
I don't really like the fact that these televisions are computers now.