hmm, weird, maybe its connected to tracks size, those three are all huge RTB creations (which all run on my low spec PC tho, can't check RAM usage or anything right now, I'm at work)
Does this track work for you? (http://www.racedepartment.com/downloads/glencoe.17121/)
Glencoe does not work for me either anymore as well. Before it did. The only thing I did with Assetto Corsa was install a ReShade and SweetFX but I un installed it correctly after. Because I had a back-up of my original Assetto Corsa (V1.15.2) installation and I just replaced the files.