Novell Vibe Desktop client 2.0
If the Mac's network is interrupted (put it to sleep, turn off WIFI, disconnect VPN, etc.) while the Vibe Desktop client is downloading files, it can hang forever. When this happens, the Vibe Desktop client needs to be restarted.
A fix for this issue is available in the Novell Vibe Desktop 2.0 (June 1, 2015), available via the Novell Downloads.