I'm using a ATI Mobility Radeon HD 4530 graphics card and I'm getting triangles extending into the terrain and sometimes following heroes too. When they're attached to heroes the triangles will also change colour as the hero(es) turns around or move. As far as I know I'm using the latest drivers for this graphics card:

Driver Packaging Version 8.961-120405a-137225C-ATI
Catalyst Version 12.4
2D Driver Version
Direct3D Version
OpenGL Version
AMD VISION Engine Control Center Version 2012.0405.2205.37728

Some screenshots:

I have also tried changing many ingame settings to no effect and same with ATI Control Center settings. Are there any logs I should be aware of that I can also submit to fix this problem? The moving triangle with heroes can be very distracting.