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Reproducible on 2 machines W7 x64 and NIS 21.4
Just went yesterday on Adobe's website to update Flash Player and NIS popped a message that "there is no available reputation information about that file", very strange as after 24+ hours of FP release there would be millions of users downloaded the file.
I allowed the installation and went to Security History, both via the Advanced NIS GUI or via "standalone" mode through Taskbar NIS icon.
The file was listed in History BUT when I clicked on the "More details" link the Security History window became unreponsive.
Everybody knows that nis.exe cannot be killed in taskmgr so the solution was to reboot the pc.
Upon reboot, same behavior so rebooted again.
Please note that this event is not recorded in Windows Event Viewer and while rebooting I got a message, (while Windows were shutting down), similar to this: (do not remember the exact codes but the message structure was the same).
Please investigate and fix...
It appears that this issue is present with files having No Available Reputation info because for all other files listed in Security History all info links work correctly.
It does not seem to affect the functionality of NIS after reboot. (NIS product corruption etc).