Dx11/64 bit version on windows 10

I still can't get this working. Wasn't an issue before, but since 2.6.3 I can't use the new mtx on the beta realm, because it crashes due to a specific mtx loading error that doesn't occur if you use dx11, but I can't use dx11, because when I do switch (with the windowed full-screen setting) the client switches to 64 bit, but also launches the 32 bit simultaneously, without either starting:



I would really like to find a solution, already tried a couple of options:

Drivers are up to date
Dx diag has been run, current version is dx12
specs: