Synchronization does not start (worked initially, stopped working at some point and cannot be re-initialized)

I have configured a local synch to a cifs share on a nas device.
Initially it worked but some time it stopped without any reason.

Now I can re-create synchronization jobs whatsoever that do not start to synchronize.
I have the impression that it stopped working as soon as the 30 days trial for the subscription were over.
Is that possible? If not: How can I get synch to work again. I do not get any error message that would help me troubleshooting.

Duplicate post - http://forum.acronis.com/forum/29370#comment-91630