Thank you, Steve and Bob, for your replies.
Is it hard for PowerPoint to allow "inline" graphics or equations?
After trying a little bit with MathType, I decided to uninstall it with the "Uninstaller" that came with it---just to avoid complications that may arise especially when exchanging documents with colleagues who don't use MathType.
I will just settle with the Microsoft Equation Editor and be satisfied with the white background and black foreground when I need to use math equations.
I remember that I could change the equation color several years ago with the Microsoft Equation Editor. Now this function is disabled in Office 2011. Could this function be enabled again?
In PowerPoint, I can right-click an inserted equation and select Format Object ... -> Adjust Picture, but the "Recolor" option there is not enabled. Could you tell why this is the case?
Thank you.