When I wrote my previous post I was still using Windows 7, 32bits. But in the mean time I’ve also upgraded to Windows 10 (64bit) but cannot reproduce any of these issues. Even though I’m also using Windows defender.
Of course I’m not saying that nothing happened; the problem here is that Windows 10 gets constantly updated so a bug back then could have easily been fixed this year.
But summing up: without any modifications I never experienced this issue myself on Windows 10. My data directory is located in the default location (c:\Users\myname\Documents\VPProjects) and VP itself is installed to c:\program files\visual paradigm 15.2.
So you might want to keep this in mind before blindly applying changes to your system.
(edit): One detail though… I’m using Windows 10 pro edition, which can behave somewhat different where rights management is concerned in comparison to the home edition.