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Someone in our group had this issue as well. After must frustration, we resolved the problem. Windows installed a .NET update on the day the diagrams stopped working. This update appears to have broken the diagram functionality in PSSE. The solution was to force Windows to check for updates again (Settings > Updates & Security, or search for "WIndows Update" in the start menu). Another .NET update was applied and all PSSE diagrams resumed working.

If your IT group manages your Windows update, you may need to have them force updates to your machines. Hope this helps!