Intrepid alpha5: More trouble with TTM buffer manager

Intrepid alpha5, updated, upgraded and distro-upgraded on Sat Sep 13.
Before writing this I posted a question, and MarcoBra suggested I'd fill a new bug report.
see: https://answers.launchpad.net/ubuntu/+question/45103
This looks like a version of bug #245888; but that bug is marked as fixed and mine is all but fixed, although my copy of Intrepid has just been updated.
Problem: on several occasions (e.g. if I type "glxinfo | grep direct" in Terminal), I get the error message (or warning):
"Failed to initialize TTM buffer manager. Falling back to classic." "Compiz.real" outputs several error messages and leaves the screen "stuck" -- I mean, the windows become unresponsive, and I get back only by choosing an option from System/Preferences/Appearance/Visual effects. Btw, no radio button is selected by default in that menu. (Under Hardy everything ran smooth. )
My gr. card is an Intel 943GML.
I had the same bug immediately after installing Fedora 9, but it vanished after a complete update and upgrade (which took several hours). [Fedora 9] uname -r: 2.6.25.14-108.fc9.i686.
Thus, I guess there is a real issue that has still to be solved in Intrepid.