Software :: Cannot Save Files In Microsoft PowerPoint?

I have a ~31 MB PowerPoint talk for work. I updated it minimally and it opens in Slide Sorter view just fine and appears normal (ie, all slides show up appropriately). However, once open, I cannot save it, either immediately or after making additional changes. Every time I save it I get a dialog box that is defective: it shows the orange PowerPoint logo on the left, and the aqua blue action button on the right, but the rest of the box is blank. I presume the aqua blue button should say OK or something, but it has not text in it. There is no text in the remainder of the box anywhere. If I click the aqua blue button PowerPoint either crashes or the box goes away and nothing happens. If I try Save As PowerPoint always crashes. Weird. I have no idea what to do.