I'm observing this as well... Also, I cannot delete or move tags in the tag tree, I found I had to us the web client to do those things. I was able to remove a tag from a note in the web client, but it is not intuitive. I had to click the + box like I was going to add a tag to the note and then hit backspace repeatedly until I got to the tag I actually wanted to remove. It is quite frustrating to have both the desktop client open and the web client open as well to pick up the slack where this new client isn't behaving.