Shift-Right/Left cursor doesn't extend selection

I just installed WL 9.5 having been a Wavelab user for many years. In past versions, holding the Shift and pressing the left or right arrow would extend or reduce the size of the selection. According to the WL9.5 manual (pdf) on page 30 it also says that this will work, but I try it, the results seem unpredictable from doing nothing to extending to a marker, or random extending the selection. I am using Win 7 Professional. Any ideas?

Control + Shift + arrow works, to select to marker boundaries, but you are there is a problem with Shift + arrow. I note this for the fix list.