I had faced the same issue it was resolved after following the below steps:
(a) Upgraded the JAVA version on the IPS manager to the latest & rebooted the manager appliance.
The issue resolved the delay with IPS manager console & also the Real Threat Analyzer window.
(b) Faced the issue with client workstations on accessing the IPS manger via https on opening the Real Threat Analyzer windows,
so excluded port 8555 from the firewall from manager to client subnet.
Hope this should resolve your issues.