Sadly... it's taken me nowhere
Urm..... you sense that should have worked
I've reset the thumbnails at 149px and checked the hard crop box but they're still displaying at 149 x 15px
I've taken them out once, saved with the new specification, and then repopulated the gallery, and saved again, but that doesn't appear to have done the trick. It's as if there's something else over-riding it?