Xolox client 1.4 Beta 1 build 455
Windows 2000 Pro SP3
Intel P4 1.8 GHz
1500/128 DSL

I have had two very large (200MB+) downloads hang at 99%, while a third download of the same size completed successfully. It is common for me to have many downloads sitting in my queue for days (or weeks) at 90-99% completion, but I was watching these as they should have completed, and they didn't.

I have also experienced more SAFE DOWNLOAD MODE downloads with build 455, but that's probably just a coincidence.