In our continuing efforts to provide high quality products, Autodesk has released the following Hotfix for Inventor 2011 (see readme file for detail). Note: Windows 8.1 is not supported for this Inventor release.
http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=22541232&linkID=9242019
We thank all our customers who identified this issue and reported it to us. These reports give us the opportunity to improve the product and provide you with the best solution in mechanical design. We also thank you for your continued business and for feedback regarding the content of this Hotfix.
Respectfully,
Autodesk Inventor Product Team
![Autodesk Design & Make Report](https://forums.autodesk.com/t5/image/serverpage/image-id/1350519iCB55845EBFC43016/image-size/large?v=v2&px=999" "Autodesk Design & Make Report")