In transform tool, when using Guided, the loupe is low res

So I have found that turning off and on GPU in the performance tab in preferences it fixed the problem, but once I open and close lightroom it goes back to being low res. So every time I open lightrrom I have to deactivate GPU and activate it again. 

It didn{t happen before, so it might be something about the new update. 

Thanks.

FYI this is my Sistem Info

I have found that zooming into the image (not necessarily 100%, 50% will do fine as well) makes it a lot easier to place the guides, because they don't move so much with every little movement of your mouse. It also kind of solves this problem, because you don't need the loupe anymore to see what you are doing. Hold down the space bar to temporarily change the cursor to the Hand tool to move around in the zoomed image (or use the small preview in the upper left corner) to place the other guides.

I cannot replicate this on Mac or Windows. There are no changes in the Guided Upright loupe that I can see and nothing like the low resolution you are seeing.  Since you are on Windows, I would recommend checking out your GPU Driver to see if needs an update or a reinstallation. 

If you post some system information, one of the Community Experts can help you.