PowerPoint 2007 is open, with any of my .pptx files, just sitting there, not doing any editing or anything else with the file.
Every minute or so, it goes Ding, with no message that I can see. The only way I know it's PowerPoint causing this is that it stops when I exit out of PowerPoint. It also seems to not ding if PowerPoint is not the active applications, but I think I've seen it happen both ways.
I have no macros running, in fact no macros in the .pptx file at all.
Pretty annoying. Recently moved to Office 2007, so may be some rookie setting.