Thank you for your post.
Is the Admin Console being run on the server? Or, are you accessing from another computer?
It sounds like Admin Console is failing to connect with the server. Make sure that all necessary ports are open. You can find a listing in Knowledge Base Article #6427:
Do you have any plug-ins?
Since Admin Console is Java based, what version of Java are you using?
Any other information you can provide may be helpful.
Thanks for responding. No plug-ins. I was running the Admin Console on two different Macs remotely. I didn't even think to try running the Admin Console directly from the server. (Java 12.5.0) In the meantime, we upgraded to a new server and installed FM Server on the new one and the Admin Console is running fine remotely on those two different Macs. So, even though the problem wasn't solved, we no longer have the problem. Your response gives me some additional things to try if the same problem arises again. Thanks.