Groove Agent drops patterns at double speed

Hi, suddenly having an issue with Groove Agent - I very often drag loops into GA and slice them up to rearrange them. The first stage, after slicing, is to drag the midi pattern onto the arrange window.

Up until recently a four bar loop would appear as a four bar midi pattern. But not any more. For some reason the midi pattern is 50% shorter and occupies only two bars, playing at double speed. Tempo scale is set to normal.

Any ideas?