I do not know how the client works so I cannot see the traffic for myself. However you should still be able to see the URL's eventhough the traffic is SSL. Perhaps a submission for application detection is in order?
Submit an application:
Hope this helps...
Just in case you do use URL filtering:
Previous category: computer-and-internet-info
You suggested: proxy-avoidance-and-anonymizers
New category: proxy-avoidance-and-anonymizers
The new categorization is available starting with URL DB version: 2015.09.22.220
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