WebCore Error: There was a problem loading your devices

I doubt that the 2 devices I added, are causing those errors. I added two Fibaro keyfobs using a generic Z-wave button driver.
Looking at the errors, the only driver I can think of that could cause those errors, is the Samsung TV driver.
To assist you: I've been using the driver for some time without apparent issues. I don't look at the logs often, but I would have noted those messages by now - but anything is possible.
I deleted the piston I copied over from the other hub earlier today and tried to import it again now, but the import now fails. For what its worth, the piston is not using the Samsung Remote TV driver device.
Edit: I just realized that after doing the webCore update just now, I randomly opened a piston to check if I could see the newly added devices, and the Samsung TV driver is used in the piston I opened.