Sync has been working great for me for a few days; however, today I've added a third computer to the syncing network, and my Debian Linux system is having issues. It seems to sync fine for a while and then crash after giving an I/O error. After that, I can't access the web GUI, and when I attempt to kill the process, I can't: $ killall btsync $ ./btsync Can't lock pid file. It seems BitTorrent Sync is already running with pid 4729 $ pidof btsync 4729 $ kill 4729 $ ./btsync Can't lock pid file. It seems BitTorrent Sync is already running with pid 4729 $ kill -9 4729 $ sudo kill -9 4729 $ pidof btsync 4729 $ ./btsync Can't lock pid file. It seems BitTorrent Sync is already running with pid 4729 That process stays stuck there even after rebooting the computer. The only solution seems to be deleting btsync and .sync and rebooting, then unpacking the tarball again and running btsync. It works for a while, then the same thing happens. How can a process stay stuck like that even after rebooting? Anything I'm doing wrong?