I just experienced the same problem using build 1522: - installed VAX - worked for some days (I think I may have restarted VS, but I'm pretty sure I didn't restart the computer) - rebuilt the database (VAX | Options | Performance | General | Rebuild symbol database) and immediately tried to build the project using IncrediBuild, but VS hanged - killed everything and restarted the computer - when launching VS, Incredibuild was missing from the menu
For me, it was enough to uninstall and reinstall VAX, and the IncrediBuild menu was back in place :-)
I use incredibuild all the time and haven't seen the IB menu dissapear after installing or updating my install. Did you tell VAX to reset the toolbar settings during hte install? Also there is an IB option in the task try icon to reset the VS plugin ;)