Arkive says:
Any help or advice is appreciated
It sounds similar to the problem I was having (which Yoshi was kind enough to debug for me).
My problem was caused by mix-mapping, and basically having two blocks with exactly the same coordinates, which confuses and breaks the puzzle script. In my case, one of the blocks was Lagoon 4-6-1, a pillar which automatically extends to the ground (and counts as sitting ON the ground, not in the air). In my map it was extending *through* a block that was also sitting on the ground (which I had placed intersectiing the pillar via mix-mapping), and I simply had to move the support pillar to a clear space.
Perhaps look more closely at any areas where mix-mapping was used, and potential overlapping blocks while waiting for Yoshi to respond?