Roblox Studio unable to run using Direct3D11

[Iemny]

Recently I have been unable to launch Roblox Studio using Direct3D11 rendering. Changing it to either Vulkan or OpenGL allows me to run Studio and launch games, albeit slow and crashing often, presumably due to the unstable build.

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This happened after I changed the rendering back to Direct3D11.

Completely unresponsive application except for the window itself and the ribbon.

Window that appears when I open Studio and open through file, completely unresponsive and have to close via Task Manager.

This happens when I open straight from my files, not via Studio. Application and window responsive, but I can not do anything because the Studio ribbon does not load.

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Changing the rendering to anything but Direct3D11 ‘fixes’ this issue.
More than a workaround than a fix, but you get what I mean.

A private message is associated with this bug report

[LightSettingsGuy]

Are you able to open the Roblox App and play experiences?

[Iemny]

Yes. Everything is behaving as expected across any game or application on my computer except for Roblox Studio.

[m0bsterlobster (mobsterlobster)]

Hi Lemny, thank you for reporting this bug.
Could you please confirm that you’re still experiencing this issue?

[Iemny]

I just so happened to have found the issue yesterday.

Long story short, GPU Tweak III was the issue.
Even though I had installed it just to keep an eye on my system’s performance, (not to overclock or boost/edit anything,) unaware to me it also injects itself into every program you run. I found out when I tried to launch Minecraft, only to have it give me a pop-up warning - directly naming GPU Tweak III and that the game can not be played while having it installed.

I uninstalled it, and everything went back to normal. Why Roblox Studio and Minecraft were the only programs so far to be unable to run is unbeknownst to me, but at least that fixed it.