My Acrobat 9.0 is no longer recognizing my Canon MF4150 when I try to scan. It worked fine until this morning. Now it says it doesn't recognize it. Yet I can stills can in Print and other programs.

Hi sllimovi ,

Please provide the exact dot version of the software & OS installed at your system .Also check whether is there any update available for the software after going through "help > check for updates "

Follow this thread to reset the preferences for the Acrobat software:- How to reset Preference settings in Acrobat.

Open Acrobat, navigate to Help menu & repair the installation.

Please refer to this KB article :- https://helpx.adobe.com/acrobat/kb/troubleshoot-scanner-issues-acrobat.html

If the scanner is connected to the server, connect it locally with the machine & then check.

Also check with the different user account with the Admin rights to replicate the issue .

Regards,

Yatharth