Took a while (had to update Parallels and re-install Windows and download Revu Trial). On my Mac, running Revu in Windows 7 Pro in Parallels the line tool WILL constrain to 45 degree increments IF you press the shift key BEFORE you click and start the line. If you press the shift key AFTER you start the line, it will not visibly constrain the line while you draw the line - but if you end the line close to one of the 45 degree increments, it will snap to it. This latter is really weird - but it works.
With the polyline tool, it gets even more weird. Start the line, then press and hold command-shift. The line doesn't visibly constrain - but get it close to a 45 degree increment and click, then it does snap to that constrain. THEN release command-shift. If you want the next segment of the poly line to constrain, then press command-shift AGAIN and the process repeats. But you must press and release for each segment of the poly line you want to constrain. But it won't visibly constrain until he release - which is very weird.
That's what I've found so far. Sounds pretty buggy to me.
