FreeFileSync Forum

Just installed the beta and tried it, and scanned fine (for Compare). Then it hung 0.2% into synchronizing. Now, after restarting FFS, it's giving me the original error message again. Gonna try rebooting the computer. Looked promising at first.
Okay, it wasn't rebooting that was needed, just ...

The error message in your second screenshot is interesting. I checked the corresponding section of code and found the error handling to be a bit too pessimistic (FFS bails out too early). Provided that the error shown is actually for a different MTP device, then FFS should continue checking.

Let ...

Whatever the problem is, it works in my tests on Win 10 x64, so this must be something specific to your setup. Can you post a view screenshots showing the paths as seen in Windows Explorer and also in FFS with the corresponding error messages?
Here are 4 screenshots, named accordingly, to show 1 ...

I have the exact same problem. I had a sync set up in Windows 8.1 and it worked fine. It stopped working when I updated to Windows 10. The saved batch file shows this path: "mtp:\Treble3\Card\Music". The path is still correct, but FFS now can't find it.

Windows Explorer shows it as "Xanadu4 ...