Currently, the scheduler is giving out R00302 WUs and returning "file not found" when attempting to send them. (This has already been mentioned by joneill003, but at the bottom of an unrelated thread.)

<core_client_version>5.10.45</core_client_version>
<![CDATA[
<message>
WU download error: couldn't get input files:
<file_xfer_error>
<file_name>batch00302_R00302_80c37c1c3b1b23c50f8aa6f3696505b0.sequence</file_name>
<error_code>-224</error_code>
<error_message>file not found</error_message>
</file_xfer_error>

</message>
]]>

That one WU has 10 "other" and 22 "error" statuses so far. There are many other WUs in the same situation. As soon as a machine asks for more NRW work, it cycles through another set of them.