I don't experience it with my self built client in any portals (nightly updated to ps/cs trunk HEAD, sometimes during the day), but I do experience it with the release clients (checked at laanx temple)
standard build options: --without-python --enable-cpu-specific-optimizations=native (for both cs and ps)
am not 100% sure, but I don't recall seeing it with --without-python --enable-cpu-specific-optimizations=no --enable-debug for both, either
system stats:
CPU: AMD Phenom II x4 965
RAM: 8GB Kingston Value ECC unbuffured
Mainboard: ASUS M4A785TD-V EVO
GPU: Radeon HD 5770
gfx driver: fglrx 10.2
OS: Scientific Linux x86_64 5.4 with latest updates (based on Rhel 5.4 - officially supported and tested platform for fglrx)
art is updated on a needed basis (each time an official update is released, platformupdate disabled)