[Plugin: BulletProof Security] secure .htaccess makes the plugins cannot be deleted

1. Is this an Apache Linux Server?
2. Are you using a custom permalink structure?
3. Did you use the AutoMagic buttons to create your .htaccess Master files?
4. Did you activate all BulletProof Modes?
5. Are you using a cPanel tool called Hotlink Protection?
6. Are you using PHP5 and not PHP4?
7. Are you using a php or php.ini handler?
8. Is your Server API CGI or DSO?

For .htaccess skip / bypass rules for 3rd party apps outside of WordPress please see this help post >>> https://www.ait-pro.com/aitpro-blog/2252/bulletproof-security-plugin-support/checking-plugin-compatibility-with-bps-plugin-testing-to-do-list/#Custom-PHP-Applications-Outside-WordPress

1. Is this an Apache Linux Server? Yes
2. Are you using a custom permalink structure? Yes
3. Did you use the AutoMagic buttons to create your .htaccess Master files? Yes
4. Did you activate all BulletProof Modes? Yes
5. Are you using a cPanel tool called Hotlink Protection? NO. The control panel is provided by IXWebHosting.
6. Are you using PHP5 and not PHP4? PHP5
7. Are you using a php or php.ini handler? Yes
8. Is your Server API CGI or DSO? Should be CGI, how to check that?

I have personally installed BPS Pro on websites hosted on IX Hosting so it is not an issue with this Host / Server itself and a conflict with the .htaccess files that come with BPS. So there is some other factor involved here that is specific to your website that is causing this problem.

You can ask your web host support folks what your Server API is. It should be CGI.

The only other thing i can suggest to try next is deactivating all of your other plugins except for BPS, switch your Theme to the WP 2012 Theme and then test and see what happens. Thanks.

If you are using a custom php.ini file on IX Web Hosting then see these custom php.ini setup instructions (if you are not then disregard this) >>> https://www.ait-pro.com/aitpro-blog/2853/bulletproof-security-pro/php-ini-general-and-host-specific-php-ini-information-for-bps-pro/#ix-hosting

Do you have these plugins installed? Firewall or Better WP Security? Both of these plugins cause this problem.