UT99.org | Unreal Tournament Community

Sorry for the question, I don't know if this is the right topic here. But currently the few Brazilian UT'99 servers use exactly this version of ACE v1.2e. But when I play on ACE servers, my game graphics are choppy, like they're "blinking" and almost showing stuff through the walls (almost transparent). Could someone help me with this?

p.s.: I use the updated Opengl (utglr37). My UT'99 is 436 version.