Thank you for including Replication Markets! A couple of notes:
Interesting! We designed "safe mode" to be safe against the common newbie failure of losing all cash in a few big trades. It achieved that much at least. Each trade spent max of about *1%* of your cash, and moved it at most halfway towards your goal. A dedicated newbie could still burn cash, but it took effort.
Still, from your report, that may have happened more than I thought. If so, it may not even have achieved its main design goal. :-(
"The worst thing" was indeed atrocious. We fixed that fairly quickly, but ... ugh.
Thanks for the thoughtful critique. We're about to reuse the engine. I'm giving this some thought.