One linux box, two X servers, two instances of workrave, connected via the network.

I would expect the main windows of both instances of workrave to look exactly
alike. This isn't so. The workrave on the least recently used screen shows a
very old state in the progress bars, with the text "inactive", instead of the
appropriate times.

You probably missed the discussion about distribution some while ago. Instead of
keeping all workraves synchronized, I took the easy approached: Only the
"active" workrave has the most recent state. When you move to another computer,
the state is also moved to another computer. This has one big advantage: You
collegues can't see on computer A how hard you are working on computer B. 

This behaviour is probably not going to change... However, the progressbar
should be reset when it says "Inactive"

Progressbar should be fixed.

I'm not sure I agree with your design. I'm concerned that state and statistics
won't be saved on my "main" machine if the last computer I worked on was a
different one. My collegues catching me working also isn't much of an issue for
me. I'm much more concerned that they may think I'm inactive because wr says so.

But I'll shut up until I find a bug :-), or seriously start using this and have
some more insight in the features I'd like to see.