When I type in a text box in InDesign, the Font Size dialog box blinks and InDesign doesn't register all my keystrokes. It seems like it's "thinking" in between each key and missing strokes. I started a new document, tried a new keyboard and restarted and still have the issue.
I noticed I wasn't on the latest CC version on my PC, so I updated and after the CC update I didn't have the issue for about 5 minutes, until it came back again. Any thoughts? I haven't reset my preferences yet.
After some research it turns out that Suitcase Fusion 5 may be the problem. Like most font management software, it's quite buggy at times. Thanks for the suggestions, I'll look into re-installing and updating Suitcase Fusion 5. Thanks.