First time I've ever had this problem. Not sure what I accidently pressed but for some reason. When I was about done with my new song.. I still had the Rhythm track to go over and edit.. something went wrong and now I cannot select notes that are inbetween beat markers, won't even highlight them. It just jumps my selection to the next beat marker note.

 

Any idea how to fix/undo this? I can't finish this song until It is fixed. Any help would be greatly appreciated.

Anybody?

I'm guessing you set a grid snap value of 1/4 and the mouse is jumping from one beat position to the other.  That shouldn't prevent you from being able to select notes in between grid snap positions though.  Just in case, try changing the grid snap setting (the , or . keys, or use "Edit>Grid snap").