Just recently moved over to Max 9 and I'm having trouble turning off the red wireframes around selected faces in the viewport whilst editing UVs. The F4 toggle doesn't seem to remove the selected red wireframe...I'm probably just missing a very obvious button somewhere, can anyone point it out?
Ah while it might be different in 8 to 9, in UV edit mode you'll see an actual selection in the Parameters section on the right side. Right below Edit and Channel you'll see Display where it shows Show No Seams, Thin Seam, and Thick Seams. It defaults on Thick so that should probably fix your issue. Edit: Just remembered I…