I’ve been doing a bit of work with the latest beta this morning and found that the option to right click on a folder or file and scan it was missing. According to the connect website, the “Item Scan with Microsoft Security Essentials is missing from right click menu because file shellext.dll is not registered in the OS (C:\Program Files\Microsoft Security Client\shellext.dll). To resolve this issue, open a command prompt with administrator permissions, type regsvr32 “C:\Program Files\Microsoft Security Client\shellext.dll” and press ENTER.”
Sure enough this works. Thanks to 777Andrey777 for the solution on the connect website (login required).

The other issues that I have also encountered include the Windows Home Server connector monitor flags the fact that my av is out of date or turned off when the computer is rebooted – this lasts for about 20 to 30 seconds. The instructions to provide feedback are also missing on the connect website (which was not very helpful). However log files can be generated by running “mpcmdrun -getfiles” from the Microsoft Security Client\Antimalware directory within program files.