Comment 1 for bug 105278

Scale has no keyboard shortcuts by default, though it should come up when you click in the very top right.

If you're still having this problem, can you hit alt-f2, run 'gconf-editor', navigate to /apps/compiz/general/allscreens/options, then double click on 'active_plugins' and check the list? 'scale' should be listed in there, if not adding it should help.

If scale's loaded in active_plugins, can you navigate to /apps/compiz/plugins/scale/allscreens/options, and check initiate_edge and initiate_edgebutton? initiate_edge should be TopRight and initiate_edgebutton should be '1' (setting it to 0 activates scale in the top right without clicking).