Stockpile: Is this also the case if you start revolt.exe straight from the Re-Volt directory? I have not yet encountered issues with the music restarting in the GOG version - but if the GOG version somehow emulates the CD music, then I can confirm this bug. It has something to do with the way that Miles Sound Studio CD Audio is handled on Windows Vista/7/8 making it unable to continue the music (basically the way resuming music changed since windows 98 and since its a thing in the old MSS library the 1.2 developers have had no luck fixing it).
I don't seem to have this problem if I start revolt.exe straight from the Re-Volt directory though. Not sure if that works for you?
Unfortunately, the same thing happens if I run it from the directory. It's not that big a deal but it's mildly annoying