Quick fix for Revit 2012:

  1. Close Revit
  2. Go here, download and extract ZIP
  3. Go to Revit 2012 Program folder and rename AdWindows.dll to AdWindows.dll_OLD
  4. Copy AdWindows.dll from the extracted folder to the Revit 2012 Program folder
  5. Open Revit Architecture 2012 – your ribbon problems should be fixed

For Revit 2013 links, see below:
Ribbon behavior problems occur in Revit 2012 and 2013 after the installation of Microsoft .NET 4.5, which is one of the pre-requisite for Revit 2014. This is why this problem is typically encountered after Revit 2014 is installed side-by-side with a previous version of Revit. For those using Revit 2012, the Autodesk Revit 2012 – Ribbon behavior due to .Net 4.5 installation hotfix will resolve this problem. And for Revit 2013 users, the fix is included in the latest update releases, which are available from the following links: Revit Architecture, Revit MEP, Revit Structure, andRevit.

Tony Michniewicz
Autodesk Revit QA

Related forum thread:
http://forums.autodesk.com/t5/Revit-Architecture/Revit-2014-Corrupts-Revit-2012-and-2013-Ribbon-Menu/td-p/3876942/page/2

This hotfix addresses issues with meters to feet conversions indexing FARO point clouds and improves product stability when manipulating large or complex point clouds.

Make sure that Update Release 2 has been applied prior to adding the hotfix. Verify that the build number of Revit 2012 is 20110916_2132.

The Readme contains the latest information regarding the installation and use of this update. It is strongly recommended that you read the entire document before you apply the update to your product. For your reference, you should save the Readme to your hard drive or print a copy.

Readme (htm – 97Kb)
Revit2012_Point_Cloud_Hotfix.zip (zip – 3810Kb)

 via
Autodesk – Autodesk Revit Architecture Services & Support – Hotfix – Autodesk Revit 2012 – Point Clouds

I previously posted about this hotfix here, but now Autodesk has updated a few things.  The mem_hotfix zip file now only includes a 64-bit version of Utility.dll, where the original also included a 32-bit version. 

Also, this update now includes an associated Cloud Rendering hotfix (see below):

Hotfix – Autodesk Revit 2012 – Improves stability when working with large datasets (64-bit only)

This hotfix improves product stability when working with large datasets.

Make sure that Update Release 2 has been applied prior to adding the hotfix. Verify that the build number of Revit 2012 is 20110916_2132.

NOTE: This hotfix applies to the 64-Bit release of Autodesk Revit 2012 only.
The Readme contains the latest information regarding the installation and use of this update. It is strongly recommended that you read the entire document before you apply the update to your product. For your reference, you should save the Readme to your hard drive or print a copy.

readme-Revit (htm – 84Kb)
Revit2012_Mem_hotfix_x64.zip (zip – 6005Kb)

The above hotfix when applied will impact anyone whom uses the Autodesk Cloud Rendering add-in for Autodesk Revit 2012 products.  The below hotfix will need to be applied to ensure that the Autodesk Cloud Rendering add-in remains functional.

The Readme contains the latest information regarding the installation and use of this update. It is strongly recommended that you read the entire document before you apply the update to your product. For your reference, you should save the Readme to your hard drive or print a copy.

readme-CloudRendering (htm – 84Kb)
Revit2012_CloudRendering_hotfix_x64.zip (zip – 65Kb)

via
Autodesk – Autodesk Revit Architecture Services & Support – Hotfix – Autodesk Revit 2012 – Improves stability when working with large datasets (64-bit only)

Hotfix – Autodesk Revit 2012 – Error with linked model visibility with custom settings

This hotfix addresses issues related to a crash in RevitMFC.dll

Make sure that Update Release 2 has been applied prior to adding the hotfix. Verify that the build number of Revit 2012 is 20110916_2132.

The Readme contains the latest information regarding the installation and use of this update. It is strongly recommended that you read the entire document before you apply the update to your product. For your reference, you should save the Readme to your hard drive or print a copy.

revit2012_link_hotfix.zip (zip – 4433Kb)
Readme (htm – 86Kb)

via
Autodesk – Autodesk Revit Architecture Services & Support – Hotfix – Autodesk Revit 2012 – Error with linked model visibility with custom settings

This hotfix improves product stability when working with large datasets.

Make sure that Update Release 2 has been applied prior to adding the hotfix. Verify that the build number of Revit 2012 is 20110916_2132.
NOTE: This hotfix applies to the 64-Bit release of Autodesk Revit 2012 only.

The Readme contains the latest information regarding the installation and use of this update. It is strongly recommended that you read the entire document before you apply the update to your product. For your reference, you should save the Readme to your hard drive or print a copy.

Readme (htm – 84Kb)
revit2012_mem_hotfix.zip (zip – 11247Kb)

via
Autodesk – Autodesk Revit Architecture Services & Support – Hotfix – Autodesk Revit 2012 – Improves stability when working with large datasets (64-bit only)

If you are running Revit French, Italian, German, Spanish, Simpl. Chinese, Korean, Russian, Polish, Braz. Portuguese versions, you may need this…

This hotfix addresses issues related to incorrect icon displays in the Ribbon UI after installation.
Affected Products:
Autodesk Revit Architecture 2012: French, Italian, German, Spanish, Simpl. Chinese, Korean, Russian, Polish, Braz. Portuguese
Autodesk Revit Structure 2012: French, Italian, German, Spanish, Simpl. Chinese, Korean, Russian, Polish, Braz. Portuguese
Autodesk Revit MEP 2012: French, Italian, German, Simpl. Chinese, Russian, Braz. Portuguese
Note: This does not apply to English versions of Revit 2012 products.
The Readme contains the latest information regarding the installation and use of this update. It is strongly recommended that you read the entire document before you apply the update to your product. For your reference, you should save the Readme to your hard drive or print a copy.

Brazilian Portuguese

Revit_ 2012_Brazilian_Portuguese-Ribbon-Icon_Hotfix_x86.zip (zip – 449Kb)
Revit_ 2012_Brazilian_Portuguese-Ribbon-Icon_Hotfix_x64.zip (zip – 449Kb)
Readme (htm – 87Kb)

via
Autodesk – Autodesk Revit Architecture Services & Support – Hotfix – Incorrect Ribbon Icons