In Office 2007 I am able to 'blank' my PPT presentation, then toggle to other applications using alt-tab. When finished I can toggle back to PPT and return to the presentation (B key).

I just upgraded to Office 2010. I can still blank the screen with B key, but every attempt to toggle (alt-tab) returns PPT to presentation mode. The weird part is that almost any key returns to presentation mode from the blank screen. B key (or period) is supposed to the blank screen toggle key.

Has anyone else seen this? Fixed this? Is this a bug? I relied very heavily on this feature in my presentations.

Thanks.