No the blocks are racheting ok. Of course this was the first thing we've checked. I think we all had the case once that we used them in opposite direction, and that happens only once ;-)
As the spinnaker is quite old it's rather bunchy (is this the right word?) But we have the the pole quite low, see picture of yesterday.
Yes sheet goes from hand cross the trampoline to the beam block to the racheting block on the stay.
We use a sheet out of 1 length, so shifting is rather difficult.