I had a little problem with this one on my current run. I downloaded it through the downloader in the launcher originally, and everything worked perfect in my first run. I patched to 1.2 after completing that quest on the first run. When I patched to 1.2, I removed all the .dzip files from my install folder, except for the one I was supposed to keep, as per the instructions. Everything seemed fine. I finished my first run and started a new run. I got the notice from the board when I got to Flotsom, but I couldn't get the quest started. After going back and forth to the bridge and checking the notice board several times, I decided there was a problem. I exited the game and looked in my game folder and all the other .dzip files were there except for the troll one, so I took the file I had previously used before the patch and dropped it back in the game folder, and then I was able to complete the quest normally.
That may be the problem. I thought it was a fluke for me, but maybe it is another bug caused by the patch.