Hi Anshu,
At the moment I have 2 x Win 10 PC and 2 x Iphone 5s/6 with iOS 9.
Enpass Windows Version 5.2.0
No I haven't tried any other cloud as I want to keep the Synch "in-house". I've been using ownCloud for a couple of years now and never had any issues, plus Enpass iOS don't seem to have any issues when syncing.
No Antivirus/firewall that could be messing with Enpass
I'll create and email you a demo account, thanks!