we have solved the problem of the missing ribbons when using autocad 2011 and SP4
1) set your workspace switch to the workspace you require and close down the programe
2)now go to where the advance steel toolbar menu files are saved
ours we'r saved under - C:\Documents and Settings\All Users\Application Data\Graitec\AdvanceSteel\2010\Steel\Support\Toolbars\2009
Delete all the files ending in .mnr
3) open auotocad only
4)Now go to open and open an advance steel drawing (Advance steel will load up and will reload the mnr files.
5) your ribbons will be back