I have the same problem, Password manager closes after a few seconds.
Sorry I didn't see your post, but I have posted my issue here:
Originally I thought my problem is that the Password manager signs out after each use when logging into website. But later I realized I can not even open the Password manager interface to change settings, because as you said, it closes after 3 seconds...
I have uninstalled and re-installed the Password manager. I have uninstalled and re-installed tho whole Kaspersky Total Security. Whenever I log into the Password manager, it appears for a second and then disappears.
I have been using Total Security for years. I recently got a new computer (with Windows 10 Pro). My Kaspersky licence is due for renewal in a few days. I'd like to know by then if I will be able to solve the issue with the Password Manager. Anyone had a similar problem?