Greets, here's one I can reproduce everytime. Open a Live project, and put it in Session View. Now from the file menu, choose Open Recent Set. The header for the project will show the new song's name, but the project still shows the previous project's clips in the session grid. If you hit the spacebar, the new song loads, though again, the previous songs clips are showing.
I can reproduce this 100%.
MBP c2d, 10.4.9, Ultralite