Boy, what a flashback. I haven't run RC5 for a long time (back when a Cely300A@450 was hot stuff

), which means I can't remember the exact syntax. Sorry. Bump for you though.
What I do remember (and it may have changed) was that using the remote buffers (storing wus on a networked folder) was problematic and running PProxy took care of things.
Hopefully someone will come along who uses RC5 and help out.
oh, and it might help troubleshoot if you posted the path syntax you are currently using.
