FortiAnalyzer 200F GUI Login Screen Failure when accessed via FortiGate SSL VPN

I have configured access to a FortiAnalyzer 200F via a FortiGate SSL-VPN portal.  I can connect to the login GUI, enter a username and password, but when I click the "Login" button, a frame outlines the button and it does not respond.  The device functions normally otherwise. 

I am not able to test login to the device locally at this time as it is in a remote location that I do not have access to.  I do have SSH access to the device through the same SSL-VPN portal and there are no issues.  

Any hints or suggestions or solutions appreciated!