Hi There,
I did use the free version of your plugin.
My pages have been styled with WPBakery and the password I was using was at first test because I wanted to test it first then I changed it to something like Xyx_2Yd and I couldn’t enter the protection page anymore. I did change it to test again and this didn’t helped. I also have deleted the browser cache, thought this might be the problem but without success.
And I don’t use any caching plugin.
Regards