Gill your eco works fine in 7.5 and below, 8 crashes every time.
Tried my issue in 7.5, same problem with "pastures".....Tried it in 7.4, no problem at all, there is clearly some failure somewhere regarding eco's I think.
I think I'll go back to 7.4 for now until they sort it.

Injustice will be avenged.
Cofiwch Dryweryn.