Whenever I tick the "align planar faces" box I get this message:

We are sorry, Linden Lab has discovered degraded performance on your connection to the region you are on. You will need to restart Second Life and log into a new region for the next 30 minutes to an hour. We apologize for the inconvenience.

After that, I am unable to edit any objects or textures.

I mainly use Firestorm, so that was what I was using when it first happened. But it also happens on the SL Viewer. I have also tested on different sims and in a sandbox with the same results