I have been working with a friend in northern California who has a Tascam 2X2 (he is a beginner that I turned on to SONAR). I used Team Viewer to get him set up and running.
 
Everything was working until he called me up telling me that he can't record.
 
I remoted into his computer and found that SONAR no longer sees the Tascam. In Device Manager, it shows up as working. I know about unplugging and plugging the USB from the Tascam, but even this doesn't work anymore. I tried all the different drivers that are available on the website, still nothing helps.
 
At this point I learned that he had gotten a Windows update (he is on Windows 10) and that is when things stopped working. I wish he would have mentioned this earlier...
 
Is there a way to fix this?
-Charles

I think you can uninstall versions of win 10. Well it worked in 10 pro. settings/under update/advanced/ view update history then its right at the top.

You can generally go to a restore point to test if it was the update that broke the driver. And you can generally restore the driver. And you can prevent Win 10 from installing drivers automatically without disabling automatic updates altogether.
 
http://www.howtogeek.com/223864/how-to-uninstall-and-block-updates-and-drivers-on-windows-10/
 

I have a US-16x08, and am current with Win10 updates. I've had no issue with its driver.
 
I know that doesn't help, but I'm wondering what the Events tab in the Device Manager entry for the US-2x2 shows.
 
Note that some major Win10 updates, like 1511, will reset some Preferences back to Microsoft's preferred defaults. I'd do a bit more research before I'd suggest rolling back.
 
Things like the Realtek HD audio driver can get reenabled, for example.
 
I've been dealing with a wicked little issue...my AMD display driver crashing and recovering several times per day. I think I have that bad boy resolved. When I disabled and then uninstalled the Realtek driver, it left a nasty bit behind. Yesterday, I discovered a Service called something like Realtek Loader trying to start...and failing...and failing (no driver!). So I got rid of that service. Haven't had a display driver crash since.
 
Knock wood.

Sylvan
I have been working with a friend in northern California who has a Tascam 2X2 (he is a beginner that I turned on to SONAR). I used Team Viewer to get him set up and running.
 
Everything was working until he called me up telling me that he can't record.
 
I remoted into his computer and found that SONAR no longer sees the Tascam. In Device Manager, it shows up as working. I know about unplugging and plugging the USB from the Tascam, but even this doesn't work anymore. I tried all the different drivers that are available on the website, still nothing helps.
 
At this point I learned that he had gotten a Windows update (he is on Windows 10) and that is when things stopped working. I wish he would have mentioned this earlier...
 
Is there a way to fix this?
-Charles

If it persisted after a reboot, most likely the ASIO driver somehow got unregistered. Try reinstalling the driver.
Also check if there is something like ASIO4All that is blocking the Tascam ASIO driver from being seen.