the folder if you didnt install DB anywhere else will be
- Dark Basic Software - Dark Basic Professional
and the keywords files are found here
Dark Basic Software\Dark Basic Professional\Editor\Keywords
what ever the case this holds the keywords files that makes things blue.
If you havent updated your editor or something has gone quirky with the installation procedure then just reinstall or update your editor.
I had an issue like this when trying to get the keywords to work for ROBks BLUE interface, I had not updated my editor and I just reinstalled in case as well.
DBP has a neat repair feature as well as a neat add remove programs screen in case this happens.
Remember to back up your work before hand if you keep stuff inside the installed folders.