After some Windows patching the processes probe is no longer able to see the details of the isass.exe process.
UIM 20.4 processes probe < 4.80
The issue is caused by insufficient permission by the probe to read those processes and display the right information. If the probe doesn't have enough information it will not be able to display the process correctly. A Windows protection that prevents the process from showing was possibly put in place.
Under F135929: 'Processes probe to workaround limitations implemented by Windows protection' a new version of the probe was issued (GA), processes 4.83
The probe can be downloaded from: the Nimsoft archive