Hi, no, the problem was something else: I tried everyting, delteing caches, Reinstalling BTSync, nothing worked, except: I removed the Folder I wanted to sync everywhere, then I changed the secret, and then reindexed and synced everything again (took me 30 seconds). Now one honest question: Do YOU store the the folder contents on your servers? The Problem was: I had some files with some special carachters (because I imported some files from a 850 charset through ANSI to ISO8859 up to linux UTF-8 coding, very weird!), and they could not be synced (Linux <-> Windows) for obvious reasons. I saw that, and renamed the files under Linux, and they have been synced correctly, But ... For some reasons (I saw that on the BTSync Mobile App) the old filenames were still in the cache, and I deleted all caches and removed the folders in all BTSync clients, but these files were still there, and they were not listed on my PCs anymore, but they still existed in some cache seomwhere. So, now, please guys: Do YOU store a copy of the folder index somewhere???!!! Changing the Secret (by one bit!!!) solved the issue. Guys, really honestly: Do you cache my directory index somewhere???