The PC system is 64-bit win7. Roon is a lifelong version I bought.
Regardless of the 1.6 upgrade, or the official website download 1.7 reinstallation; whether it is to upgrade or reinstall 1.7 (500) or 1.7 (505), roon cannot be used in the above method.
The specific performance is: flash back a few seconds directly after startup.
I have also tried disabling some PC’s hardware, and it doesn’t work either.
If this is the OpenGL problem and you have a spare slot, a cheap OpenGL 3 capable graphics card might do the trick. What is the full spec of the machine, and is it being used as the core?
Can you please share a copy of your Roon logs from the affected client by using these instructions? The best way to get them over would be via a shared Dropbox / Google Drive link.