We can't see the tool text in the Bibbon in Revit Architecture 2011 UI. Please anyone suggest how can we resolve this issue. Please see the attachment. We are in a big trouble
Try going to the Purple R, then Options, Graphics, and turn off hardware accelleration and anti-aliasing, etc.
Then restart Revit.
Also, make sure the computers do not have .NET framework version higher than 4.0--this is a known cause
for problems with the ribbon in Revit 2011 ans 2012; it has been fixed in 2013 Update 2.
Do all users have the same problem? Or just a few? Does it occur on all projects? or just a specific project?
Worst case solution may be to uninstall/re-install Revit.
Good luck!