After map change to Surf_Healthy, getting constant console spam of [ERROR] attempt to call a userdata value Probably 5-10 messages every second. Generating "Something is causing script error" messages. Rejoining resolves but obviously something not right there. Time frame 00:10 BST.
This has happened to me before. Can't say whether it was on healthy or not but that was the same message in my console.
Amusingly, I also saw this last night, and re-joining fixes it. Problem is, we've got no way of tracking down what's causing that and we suspect it's an actual corruption of the lua state. The errors with stacks that I did see were coming from Derma, which is a Gmod in-built library.