I then went back to my original Windows 10 VM that I first found the FF57 startup flashing windows problem and unchecked the show accent color in "Title Bars" and FF57 started up correctly. I was able to reproduce this behavior multiple times. I could once again correct the problem by making either one of the changes that I indicated above. With further testing if I let "Windows automatically select an accent color" and left the show accent color in "Title Bar" selected and FF57 started correctly then I could close FF57 and then choose my own "Windows Color" again and FF57 would startup correctly until then next reboot and then FF57 would go back to the flashing window at startup again. If I then went back and reselected those two options FF57 would exhibit the startup flashing window problem. If I either let "Windows automatically select an accent color" or unchecked the show accent color in "Title Bar" then it would correct the problem and FF57 ran correctly.
Luckily I had taken a snapshot of the fresh install before customization that worked so I went back to that and then made each of my customization changes one at a time testing FF57 after each change.įor me, I was able to identify that under Settings|Personalization|Colors if I had both a "Windows Colors" selected and show accent color in "Title Bar" selected it would produce the flashing windows on FF57 startup. I then started to do my usual Windows 10 custom settings all at once and then FF57 started having the same startup flashing problem.
I then created a new VM with a fresh Windows 10 install and a FF57 install and FF57 worked correctly.
I was also experiencing the same FF57 startup flashing window problem on a Parallels Windows 10 Pro 64bit VM on a Mac Mini late 2012 with MacOS Sierra latest version but not on my Windows 7 or 8.1 VMs.
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