Hello,
As of today I am using iTunes Windows version 12.9.6.3 version which I downloaded from Apple.
I have an ultrawide 3440 x 1440 Alienware monitor and have been facing the DPI issue.
Recently I saw this forum and wanted to report that the DPI issue still does exist in version 12.9.6.3 when the scaling is greater than 100 it will display gray boxes in iTunes. As we all know the DPI issue technically has been never fixed by Apple even though this has been documented and reported to Apple since early 2016.
Even when trying the suggestions from okcameradude I am sorry to state images do not display correctly when my scaling is set to 125. They are gray boxes.
The only solution that I see that does work is setting the scaling to 100 and changing the ease of use settings to 125. However this is not an optimal solution as it does not scale other objects other than text. My eyes are not 20-20 anymore and I need to use DPI scaling.
As a software developer myself it amazes me that this issue has persisted this long without even an acknowledgement from Apple to designate a roadmap or fix. Seriously if my digital library was not the size it is I would have simply uninstalled iTunes and chose a more competent provider.