About half the time I drive a screw into a pocket hole, the screw bites in and goes into the material, but doesn't tighten down. It'll freely spin, even on a relatively low torque setting (10/24)
Other times, the operation works as expected.
This seems to occur most often with coarse 1 1/4" screws into 3/4" (1x4, 1x8) pine, but I seem to recall having the issue with the 2 1/2" screws (into 2-by) as well.
Does anyone have any suggestions as to what could be causing this?