OpenGL suffers major rendering errors when dying on noreload levels which are dark and indoors
Dying in a noreload level that is dark and indoors (not with F_SKY1 above) causes everything to become full brightness and all transparency breaks. Opening the menu or the console dispels these issues.
Confirmed maps this happens consistently in are Sunken Plant and the inside area of Rainstorm Keep (reach an indoor checkpoint and then die)
Does not happen in Software.