Yup, I can confirm your findings aswell. I have a Sapphire Radeon 9550 card on an Asus P4P800SE motherboard, P4 2.6 GHz HT, 768 MB DDR2. Sofar I've played with Catalyst 7.9 and had both those issues. Last week I installed Catalyst 8.7. Haven't seen the map corruption yet, but have seen the 'bow framerate drop'. Which Danlisa gives a very plausible reason for. I've noticed those (3d) map corruptions were more frequent when I changed AA settings in Catalyst control when the game was running (so alt-tab-ing often).
Unfortunately that catalyst update also resulted in my 3d dial bitmaps to show in low resolution. I hope it was just a fluke.
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