Hmm, I have no problems loading huge Pasti images under Steem. I just tried loading a 2Mb image. Just in case I tried both a separate file and inside a zip, both ways worked fine.
I do get a crash under Saint. Didn't yet investigate if the problem is in the Dll or in Saint. Even when it works ok under Steem, it might still be my fault. Don't worry, either way we'll fix this shortly enough.
Thanks for the report. And if you have more details, please let us know.