I too was dealing with backups hanging, CDP not working etc after upgrading to a newer version on Windows Server 2012. Beforehand it worked flawlessly. I contacted support/Tier 2, submitted logs and they remoted into the system and uninstalled/reinstalled several times with no resolution.
At the time, I updated to versions 6.6.0.1 and 6.6.0.3. I finally uninstalled and went back to version 6.5.1.16 released on September 22, 2016 and everything works great again. Version 6.5.1.15 Released on September 15, 2016 also works fine from testing.
Friday August 4, 2017 I tried with the most recent version 6.7.0.10 and it still hangs on backups plus I get no permission errors that I never had before. It just hangs up on backups, so again I reverted back to 6.5.1.16 and everything works fine. I did a full uninstall and cleared out all the straggling registry entries to prevent any potential conflicts before reinstalling to 6.5.1.16.
CDP functions properly again and the backup schedules work great so there was something wrong with versions 6.6.0.1, 6.6.0.3 and 6.7.0.10. Again for my particular system 6.5.1.16 resolved my issue - glad I kept all my upgrade versions to fall back on.
