Sentastico not so sentastic.

[worksmarter]

Tried with FF and IE 11, both worked fine  

Edge wouldn't even log into the panel for some reason LOL

If it is working on the other boxes, then it has to be a setting or something on the one that is failing.

All tests so far conclude that it is not a Sentastico issue

Out of curiosity, are you testing in VM's? If so I have two master VirtualBox installs and two vagrant installs that all work and have all been hacked to run php5.6.29. No problems with any of the VM's - two are CentOS 6.8 and two are 7.0.

I believe you when you say it is not a Sentora issue as that is what I am seeing in the VM's - everything working as it should - what I don't understand is why a vanilla install on CentOS 7 dedicated server with no modifications to a minimal install other than yum update fails in this way.

I would just start over, but it failed on 6.8 and that as why I went for a fresh install of CentOS 7.
I don't know how to troubleshoot this any further  as it makes no sense.