GC stopped recognising Bkool trainer

[JaRok2300]

I used GC all last winter with my Bkool trainer before packing it away for the summer.

I've just tried to set it up again and, although everything works fine with the Bkool software, GC does not detect the trainer at all.

Everything else is the same, laptop, ant+ stick, trainer etc. but GC will not pick up a power reading, whereas Bkool does.

Any suggestions as to what may be causing this?

Thanks