the following issue still exists in (2.68a/windows8) :
. create a mesh object with shape keys, attach a diffuse texture*
. create an armature, set 'deform' to BGE
. rig the object to the armature, create bone weight groups
. setup an armature action, add bricks to play it
-> texture flickering
. set 'deform' to blender
. delete every shape key
* I have several texture attached to the object (diffuse, intensity, alpha, normal) so if you can't reproduce please let me know I will whare a test file.
using a GL shader, provided you don't use texture in it, it's ok too. else it's the same issue.
if the armature is idle, the texture glitches does not move, it's like the order of verts, faces or uv is changed at every tics, when the mesh is deformed by the rig.