I noticed a bug which is MAYBE caused by CSSU. I will try to explain it...
If I'm browsing with MicroB (in Portrait Mode!) and getting a message I push the bookmark button (sometimes i clicked a link before gettin to bookmark-screen so that microB is loading a new page at this moment but i speedy push the bookmark button..) on screen to get to the dashboard (also in portrait mode..). If I push the menu button to get to the dashboard to read my message everything disapperas and gets black and my hildon-desktop is crashing.. It reloads after some seconds again. [sorry for my broken english.]

Was anyone experienced the same problem and is it caused by CSSU?