To shut off the sneak Priview pane, open File explorer utilizing keyboard faster way Win + E. If you do not use the sneak peek pane anyhow, you can turn it off to try resolving the ‘Windows explorer freezing Windows 10‘ mistake. At some point I did manage to convince myself that it seems to be a problem with opening in the 'This PC' Folder, but I honestly don't recall what convinced me of that at the time. There is an odd mistake in Windows where the preview pane crashes File Explorer. Obviously I'm not having any such issue with other programs et al. Reinstalling Resilio Sync also has no effect on this. Once it's done that, Resilio Sync is done talking about it - killing and reopening either windows explorer or Resilio Sync itself doesn't fix what's broken, I have to completely restart Windows, and I can almost never add two folders at a time - the second one will break it again. More often than not, invoking the Open or the Save as dialog resulted in Windows 10 freezing, and the only way to recover was to kill off the explorer.exe process. Options > Manual Connections > Add the key > Select a Folder), when it gets to the Select a Folder portion it hangs, (not responding).

However I seem to have an issue setting up a sync system with the new client - abut two out of three times when I try to manually add a folder (e.g. I noticed just last week that it only locks up for me.

I finally upgraded my little AWS Cloud sync server to Resilio Sync because it wasn't properly syncing with the client. Windows File Explorer worked just fine until a few months ago when I began having the lock up problem we’re all commenting on here.

Windows explorer locking up