Has anyone experience a problem with not being able to add a drumbeat loop to a prerecorded project? When I open the loop browser, there are only a few options available. The rest are greyed out. I can only choose individual drum sounds, not full beats

I have created a project and recorded 2 tracks, one with a guitar and the other vocals. I would like to add a drum loop, but when I pull up the loop browser, all of the normal selections aren't available. Some are greyed out, including "Beats". "All Drums" is available, but when I click on it it pulls up some cymbal sounds only. I've opened some old recordings in GB to see if this is a consistent issue, but it's not. Only this one project won't allow me to use drum loops. Which leads me to believe there is something I have selected or not selected within the project that's not allowing me to see all the loops. Any help would be much appreciated.

Thanks,

G Clef