[Plugin: BulletProof Security] Complete Uninstall of BPS?

Most likely your custom permalink structure has a mistake in it. See this post and compare your custom permalink tags and structure to this post >>> http://www.ait-pro.com/aitpro-blog/2304/wordpress-tips-tricks-fixes/permalinks-wordpress-custom-permalinks-wordpress-best-wordpress-permalinks-structure/

if you have a typo like a missing slash or percent sign then you will see this error.

And another possibility is that you are not using a valid php handler / php.ini handler

Yep there’s your problem. Why do you think you need to append .html to your custom permalink structure? Looking around the Internet I found tons of people getting 404 errors when using .html. 😉

Some SEO Marketing person many years ago stated that this helped with SEO. It may have many years ago, but i seriously doubt it ever really worked. Google evaluates HTML sites and WordPress sites completely differently and adding .html to your links is not going to fool Google.

And here is an ancient post from 2005 that tells you what you have to do to use this archaic .html structure >>> http://www.codingrobots.com/blog/2005/12/13/how-to-switch-to-google-optimized-permalinks-in-wordpress/
And yep you will not be able to use BPS because BPS needs to use standardized RewriteRules in order to work properly. In other words, the .html permalink hack is a no-go if you want to use BPS. 😉

FYI – this site that has this info posted is NOT using .html permalinks. LOL

Yep i did some experimentation that was borderline “not cool” SEO tactics with Google many years ago – GreyHat Zone. 😉 And did find that mimicking an HTML site did have much more value with Google, but these days what i have found is that you can do all of your SEO completely WhiteHat and still end up with prime real estate on page G1. Since Google has perfected their Algorithm to a point where it is very accurate at detecting the “real” site type then there is actually no need to try and boost ranking by mimimicking – a php site type that meets all of Google’s criteria for a high ranking page/post will be a high ranking page/post with the optimum SEO work done to it and the same applies for HTML site type SEO work.

Not sure what you are asking here?

It looks like I can’t edit my earlier posts. Do you know anyway I can get my domain name outta here?

Ok so here are the issues you will most likely face. Since you have existing posts out there with your old linking structure then you will have to create .htaccess rules to rewrite those old URL’s otherwise you will end up with a lot of legit 404’s.
Take a look at this link to see what kind of .htaccess redirect coding / rules you will need to add.
http://www.webweaver.nu/html-tips/web-redirection.shtml

Nope no control of threads and i have tried requesting that a thread be modified or removed and never had much success with that. I think most WP Moderators are volunteers so trying to monitor millions of threads is a pretty daunting task for volunteer Moderators. 😉

Typically a 500 error is caused by a typo or invalid .htaccess code in your .htaccess file. Some web host do not allow Options -Indexes to be used and this will cause a 500 error. So you can try commenting that line of .htaccess code out and after that maybe check with your web host and send them a copy of your Root .htaccess file so they can tell you what will and will not work on your web host server.

Also some web hosts do not allow you to change the file permissions of an .htaccess file to 404. Very few web hosts require that the file permission for .htaccess files is 644, but i have come across about 5 of these web hosts out of 100’s.