Hello,

We have a big problem with Houdini 20.5.278, we can't select the guides of a Groom to be able to edit them in the Houdini viewport.

you probably are using Vulkan which is quite buggy as of 20.5, switch to openGL from top menubar "edit -> preferences -> 3D viewports -> Renderer" then test again.

Yes, switching back to the OpenGL renderer is a good fallback for some new viewport issues
I would also try testing out a newer release, if that's possible
The newest production build is 20.5.370 and should include a fix for this issue, it looks like it was fixed in 20.5.238 specifically (typo, fix was in 20.5.328)

williambrown
Yes, switching back to the OpenGL renderer is a good fallback for some new viewport issues
I would also try testing out a newer release, if that's possible
The newest production build is 20.5.370 and should include a fix for this issue, it looks like it was fixed in 20.5.238 specifically

the first production build is 20.5.278 which is way above 20.5.238

Sorry, typo, the fix was in build 20.5.328, not 238