Issues opening PDF files from SharePoint document library reader/pro 11.0.5

Hello,

We have a sharepoint 2010 enviroment and recently upgraded our Acrobat X11 installs ( both reader/std/pro) to version 11.0.5.

We have a mixture of WIndows 7 32/64Bit IE 8 and IE 9 machines

After upgrading to 11.0.5 when users click a pdf file in a SP document libary one of two things happens depending if they have the

Adobe Reader Plugin Enabled or not

If the Adobe Reader Plugin is enabled, they will not get prompted to run/save the pdf file and it will not open in a new tab in the browser

If the Adobe Reader Plugin is disabled, they will get a popup window that has the correct URL to the PDF in the address bar but they will not be prompted to save or run the file.

If they click in the addrss bar and press enter the pdf will then load in the external reader/acrobat application.

This issue started with 11.0.5 updates, rolling people back to 11.0.4 fixes the issue.

I have attempted everything I can think of including rebuilding new machines with our image.

Has anyone see issues like this with the 11.0.5 update?