To add another resource up Leroy's excellent list: As MS Office/PowerPoint is not an Apple product and there are not as many Office users active here as one would think, I believe you will be better served by asking in Microsoft's Office forums. MS Office questions posted in Apple’s forums tend to linger a long time before getting any kind of helpful response.
The only trick is limiting views to Mac issues, and that’s easy.
Start here:
Results in Office - Microsoft Community.
That will display this page header:
1) If needed, use the “Office Topic” pull-down to select your Office app.
2) Limit answers to Mac topics with the “Office Sub-topic” pull-down.
3) If needed, use the “Show Filters” option to further narrow the results.
Everyone there is both an Office user and a Mac user, something you can't say about Apple's forums. I believe you will find the contributors there knowledgeable and very helpful.