I'm getting an error "Incorrect function" on quite a few SRbase tasks (about half of them) from one computer only out of my 4. Another project (tngrid) is reporting the error "disk limit exceeded". There is no disk space shortage (I have 20GB free), and I haven't specified a limit for disk space in BOINC. Any ideas what's going on?

This is one of the SRBase errors from http://srbase.my-firewall.org/sr5/result.php?resultid=263307036

<core_client_version>7.8.2</core_client_version>
<![CDATA[
<message>
Incorrect function.
(0x1) - exit code 1 (0x1)
</message>
]]>

This is the machine in question: http://srbase.my-firewall.org/sr5/results.php?hostid=60114

Just started in the last few days, changes made to the machine that might be the cause are:
1) Some windows updates (including a major one).
2) A different (very old 4MB) graphics card was inserted into the machine (just for display purposes, not crunching).
3) Malwarebytes changed from the free version (run on demand) to the trial full version (realtime).

Not overclocked. CPU at 49C. No GPU.

Removing Malwarebytes....

Uninstalling Malwarebytes fixed the problem with all three projects. Strange as Malwarebytes didn't inform me it was blocking anything.