I noticed, that the "one random frame" issue also happens with other games, specifically Dragon's Dogma and Metal Gear Rising. But it is really not critial anyways, so feel free to ignore that part :frog:
Can you please re-test the launcher/config to see if the refcounting issue is fixed?
The refcounting issue seems fixed on master.
Launcher renders fine for me on Windows + DXVK.
I'll test it under Wine in a bit.
Hi, the launcher renders fine for me on master + latest Mesa on Wine-tkg...

Tested with DXVK master on Proton 5.0-3 and it's fine now, thanks.
proton 5.0-3x1 2020-02proton 4.11-12x1 2020-01
Valkyria Chronicles has 2 issues:

On DXVK master and 1.5.1 the Launcher/Config menu seems to only update it's window once for each time it is focused - which can be triggered with i.e. alt + tab - making it unuseable.
It also shows the following error when you close it:
The launcher works fine with wined3d.
Starting the actual game also seems to display one frame of random old VRAM data with DXVK master, which doesn't happen with 1.5.1 or wined3d. I tried to bisect it, but the result looks like bogus, but here is the bisect log anyways:
bisect-log.txt
Software information
Valkyria Chronicles
System information
Apitrace file(s)
Launcher:
https://drive.google.com/open?id=1tAsHzcz8bL7zuvZxhKbcwMWmbT6886o3
Game:
https://drive.google.com/open?id=19yG5rXh9o1R0vGp92hJjv1fEpBbCqgaC
Log files
Launcher_d3d9.log
Valkyria_d3d9.log