If user connects to UMP via HTTPS, but CA Business Intelligence Server (cabi) are configured to use HTTP, no content will be loaded within cabi portlet and cabi dashboards.
The cause of the problem is "Mixed Content", insecure HTTP content is inclued in secure HTTPS content. Current browser blocks any mixed content as default.
See the details at the links below.
Mixed content blocking in Firefox (Mozilla Firefox)
What Is Mixed Content? (Google Chrome)