Well, did a hard-reset, still no luck although there's almost 16MB free memory.
However, it doesn't seem to be a Snails specific problem anymore, I think my storage card causes the strange behaviour. I still don't know why this doesn't affect 1.6, though; I found out that the Argentum demo also freezes when it's installed on the CF card - but other games don't. I'll try to install Snails 1.7 to the main memory again.
Thanks for your help so far!
