I found InDesign SavedData OK but in Windows 10, InDesign Defaults is actually under "Roaming", not "Local."
When I renamed the files, InDesign showed up with "touch screen" options and was all messed up, so I restored the Defaults to get back to normal. Of course, the problem persists.
Yes, InDesign Defaults is in the Roaming directory, which if you recheck the link, is exactly what it says.
Reverting to the old prefs certainly won't fix the issue, but replacing them might (at which point you would need to rebuild your customizations). You might want to make backup copies of the two folders, then try the keyboard method (in CC 2015 it seems to be more reliable) and see if the problem is solved, if not just copy your backups back and move on the the next thing, which in this case is probably to try booting into Safe Mode, then see if the problem persists.