I have used 'd5' successfully a few times, but I just got an Exception tonight. Two things were different this time: The Conduit Configuration box was open at the time and FileMaker was already running (although I *think* I have done syncs while FM was already running before).
The error was:
Exception Thrown
Error: 1282368363
Function: OpenConduit
File: JFileConduit.cpp
Line # 384
Logged In: YES
user_id=46136
This isn't a bug, exactly. You can't sync with that dialog open. There should be a more explicit error message, though, which is a bug.