In PowerPoint 2013, the default settings can limit some of Microsoft’s helpful features. With the default settings if you type a word in lower case, spell check automatically lets us know if there is a typo. But if you type the same word in all caps, spell check is not used. Here is my example, which according to Microsoft Office only has 1 misspelled:
The setting to change is to go to FILE >> OPTIONS >> PROOFING tab
In the WHEN CORRECTING SPELLING IN MICROSOFT OFFICE PROGRAMS section, uncheck IGNORE WORDS IN UPPERCASE
Now All Caps or Lower Case words are par of the spell check feature.
– Troy @ TLC