To reproduce (at least on a VM): 1) Download boot.iso. 2) select US keyboard layout (not sure if this is critical or not) 3) run installation 4) press Ctrl+Alt+(left/right) whilst running installer 5) note the workspace switcher. expected result: Why are there workspaces? This had me confused for a bit as at the time I had not realised my VM had my keyboard captured :)
Patch waiting for a review here: https://www.redhat.com/archives/anaconda-devel-list/2011-February/msg00201.html I am not going to be pursuing fixing this for Fedora 15 unless someone proposes this as a nice to have.
Fixed by 0ce2dc14e44e8049d489df4f89b7d6513d264679 in the next rawhide build of lorax.