Have you been using AxCrypt for some time perhaps Nadir? My guess is that the files you can’t open are time stamped at some certain time where you might have mistyped your password using AxCrypt 1 – or before a password reset if you’re using AxCrypt 2. Please contact support for more detailed help, since we can’t tell just what your AxCrypt ID is (if you have one) from the forum post.
Also, what is not cool about charging a small amount of payment for providing software and services? In this case password management. You’re free to try it for a month without any cost. If you don’t like it, don’t use it. If you do like it, you’ll have to subscribe.