Hi, Well, I didnt add any more folders. The ones I have in sync are setup on my main pc to be read only on other peers as I just wanted to backup. I've been setting up my RPi as a mirror for the main pc and I also have another pc working as a mirror also. So the folders disappeared from my main pc, but still show up on the mirror pc in the Sync Pro app. On raspberry pi the files are still there, but on the main pc didnt show RPi as one of the peers anymore. Now. I think that the folders disappeared when I upgraded the main pc to 2.2.4. The RPi is on the base install version I think, not looking at it right now. Hope these details help, but this must be bug, right? I just did some checking with my other pc. Even though my main pc client is running and hasn't changed setup and looks to have the same device key, my other pc show it as not online. If I try to manually enter the device key again, it says that I will have to delete the folder on the other PC, because its a different certificate. So what its telling me is that If I do that I will have to erase the folders from the other pc, re link my main pc device, then re-sync all 250GB of files again? I really hope not. Also, amusingly(not) my main pc says there are (0 of 1) peers online and when I click it it list that peer as the very machine I am working on right now.