Well, I finally concluded that I wasn’t having memory problems on my hosting service any more – I was having execution time limits being hit and that the message was just a tad unfriendly. There was no way around this – I had already re hosted to beat the memory constraint. I’m ashamed to admit that I hacked the code and set up another import option – the code runs exactly as if images were being imported and thumbnails generated but instead of actually generating thumbnails, the details of what is needed are written to a file and I generate thumbnails separately on a development machine that I own and upload them to the internet host. I think my execution time limit is around 60 seconds; I can import at least 950 products this way at one pass. I’ll try a larger import when I have one ready.