I installed 3.4.07 version of the forums, and added site integration and events calendar. I have the forum working perfectly, except for one thing - all posts have a very narrow topic column, rather than stretching across the screen. I can poke around in the ASP but I'm not sure which page has the relevant information.
have a look under ' Font/Table Color Code Configuration' in your admin options, that is where the left/right column widths for topics are set
Good call! Both left and right were unchanged (as far as I know)from the defaults 80 left, 80 right - but I changed the right column setting to 80% and it worked!