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Hello Pierre,
The QTVR issue is fixed in the 2013 Version, I don't think that there will be an 2012 Fix available. Please upgrade to 2013 Version and also Install the hotfixes found here
http://usa.autodesk.com/adsk/servlet/ps/dl/index?siteID=123112&id=2334435&linkID=12268769#section1
especial tzhis one is solving the issue
http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=19319648&linkID=12268769
but the others are also recommendd to install.
Hope this helps
Thank you very much,
I will ask to EDP to download the material, i will keep you informed on any issue.
I wish you a nice day.
thank you again.