Hello there. I'm playing GregTech 5.09.22 with a bunch of other mods (Thaumcraft, Forestry, ProjectRed, Buildcraft and so on). Also I have the latest versions of such mods for perfomance like OptiFine and FastCraft. All of these run with the latest version of Forge.
Here's the problem. After creating or using several GT tools (I found out problems with Bronze Mortar and Bronze Wrench) OpenGL StackOverflow error pops up, flooding into logs and causing problems with rendering. I can append some logs, but not sure exactly what you may need.
Thanks for attention.
UPD. I've figured out what causes that bug. It was BackTools mod. The stated mode fails to render several GregTech tools on players back. When you remove a tool from player's back bug disappears.
I couldn't reproduce the bug without that mode, so I believe it was the problem.