After finding that Themes saved in Theme Builder were not working in PowerPoint 2010 (Windows) and 2011 (Mac), we decided to explore the issue further, and find out what exactly Theme Builder did to cause these incompatibilities. So, to compare the Theme saved in Theme Builder with it’s original version (which was saved in PowePoint 2007/2010 as a Theme), we opened both of them in Microsoft Visual Studio, an integrated development environment (IDE) from Microsoft.
Discover the content that Theme Builder deletes from Themes.

