Thank you for the details; MS13-081 is one of those large bulletins, containing 111 English/Variant updates, and if that update is present it should be part of the Software Update Policy created.
Go to the Patch Remediation Center; highlight the MS13-081, right-click > list software updates; see if KB2862330 is present for the Win8 flavor, for you may have problems downloading all 111 updates.
Here is what my test lab shows for the Windows8 flavor:
Next, if you highlight the MS13-081, right-click > Disable, right-click > Download; watch the Log Viewer and see if any updates are having issues download, do you see that all 111 updates have downloaded in the PRC listing of Downloaded: Yes, Updates: 111, Available Packages: 111?
I reviewed my Software Update Policy for MS13-081; found these updates are present (Windows8-RT-2012-KB2862330-x64.msu on Page 7, Windows8-RT-KB2862330-x86.msu on Page 8 and Windows8-RT-KB2862330-x64.msu on Page 10):
If they are not present for your policy; can you create a test Software Update Policy for that Bulletin, and does it display the update in the Advanced tab? Watch the Log Viewer during creation and see if there are any problems during that process.
Additionally, there is a SQL script to review the associations on that KM:TECH46342. This will help view if any Software Update Policies are having issues with resource associations to packages. You may also implement the updated Stored Procedures to enhance the performance of the PMImport, for this issue could be a problem with performance during the PMImport and refreshing update downloads during 'Revise' process.
Joshua