External FX in Montage on Win 7

Anyone successfully using External FX in Montage on Win 7? Trying the demo now (currently on 9.5). The External FX works fine in the master section of a normal audio project, but within the Montage it seems to only play for a split second (I see a little level on the hardware) but won’t play. I tried the clip, track, and output sections.

I understand Win 7 isn’t fully supported but just wondering if this is something to do with my system or Win 7 in general.

I did update to 10.0.3. Sometimes I get the play cursor moving really quickly through the looped region I set, other times it just doesn’t move at all.

The latency detection button works though.