Why did you update to A6.50, the version that was removed by Conitec due to some showstopper bugs!? Could you tell the amount of polly's used for your models and what kind of graphics card you have?
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Version 6.50 (pulled due to two severe bugs, see below)
The AABB collision detection (ent_move() as well as c_move() with USE_AABB) used a wrong angle for the collision with map entities under some circumstances, for instance at the Weather Room in the Techdemo (fixed in A6.58.0). This is a severe bug and can be a 'showstopper'. Use version 6.50 at your own risk. If you are using the AABB collision detection, walk through all places in your level and check whether entities can walk through walls or become stuck in some places.
