TI 1394 signed driver only works when driver signing enforcement disabled (Windows 8.1)

I have a Texas Instruments firewire card installed under Windows 8.1. It was working perfectly until recently and now I get a "code 10" in the device manager. It displays as a signed driver when I reinstall it so it should work fine.
However, if I do an advanced reboot with "Disable driver signature enforcement" the driver then seems to work correctly.
Is this a Windows 8.1 bug or a driver bug, and does this mean I have to do an advanced reboot every time I want to use my Motu 828mk3 audio device?
Regards,
CJ.
Can't see the Enabled flag for the... err Enabled flag

Hi,
I cannot find any information about this device in compatibility center, you should contact the device manufacturer to confirm if this driver is designed for Windows 8.1.
Although, we can do some additional analysis about your question.
We can try to go into the %Windir%\Inf folder, when third-party driver installed,
the .inf is renamed to Oemxx.inf (where xx is a sequential number) to make sure that there are no name conflicts with drivers that are included with the product and with other third-party drivers. You can check it one by one, find the right file to get
catalog file, it should be xxx.cat, when you get the catalog file name, you can search this file in windows folder.
To do those actions, is just to confirm if this driver is ok, double-click the .cat file | View Signature | View Certificate | Certification Path and note the highest certificate in the chain. If the result is Microsoft Root Authority,
we need check setupapi.dev.log, there might be some clue about this issue. You can upload it in forum.
Alex Zhao
TechNet Community Support

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