Maybe with you it was an issue with .net? because I believe they may even have completely separate code bases (IE the one on sourceforge was made from scratch, after Quizio abandoned it (he then later decided to continue his work))
Though Ive had issues with various features (notably the file previewer) nothing caused explorer to flat out crash (a few features did cause a minor hang, but they were fixed with the next iteration, and I simply disabled them until then)
was it all on the same OS, and have you tried it since? Also since its noted, they can easily uninstall it if issues arise..