I am currently troubleshooting issues with Adobe Reader 10, while opening PDF files in a web application using IE, Acro32.exe opens in the background and does not open the page. Any attempt to end the process fails, if the user closes IE and attempts to reopen IE or Adobe Reader 10 application they will either freeze or start in the background and not open a window. The computer must be restarted in order to open these applications again.
Once the client is rolled back to version 9 the issue is resolved.
The web application does not open inline windows in IE; it will open a new Reader window (in normal functionality).