Revit MEP Error: Invalid Duct Fitting K-Factor Database

Does this error look familiar to any of you using Revit MEP?  Typically this error occurs when running Revit MEP on Windows Vista and usually when drawing duct or converting flex duct to rigid duct.

Without getting too technical, the issue has to do with user access rights to certain registry keys in Windows Vista.  Since we're still receiving a fair amount of cases regarding this problem, I thought it would be worthwhile to provide the simple steps to resolve this.

If you see the above error, please try the following:

1. Close Revit MEP
2. Right-click on the Revit MEP shortcut
3. Select Run as...
4. Select Administrator
5. Close Revit MEP
6. Run as the current user

Alternatively, you can log in as Administrator, run Revit MEP once, close it, and reopen it.

Please note that for Revit MEP 2010 users, this issue should be resolved in the latest web update.  If you haven't installed the web update, you can download it here.