Thanks Jeremy, I’ve contacted my host who’s been looking into this as well and we’ve hit a dead end. Having no errors listed they’ve increased the memory to upload and post limits in PHP to 200MB (and later tried increasing again.)
They’ve made it work right after an apache restart but otherwise it seems to not be lasting.
We’re both at a dead end on on this. Is there a commercial service you run to investigate issues like this? I’d hate to cobble together a bunch of separate plugins to do what your plugin offers and I’ve grown quite fond of it.