And you know that how?

Neculai, what does that have to do with mchat_install php file stating 403?

To the OP ignore what Neculai stated and via FTP check the permissions on the file (they should be set to 644) and if set correctly your new host may not allow ajax based chats so you would have to check with them.

Not sure why, newly registered has the permission to change their password.

Give you the code to do what? You need to provide more information

There is an interesting comment [url=http://arstechnica.com/staff/2014/12/ars-was-briefly-hacked-yesterday-heres-what-we-know/?comments=1&post=28141599#comment-28141599]here[/url] regarding the Ars breach, which it is presumed was done in a similar way because it was done by the same people. Cr...

According to this post http://www.rmcgirr83.org/viewtopic.php?p=28091#p28091 there is no jquery cookie code in your overall_header.

You are missing the mchat edits to that overall_header and you are already including two version of jQuery on every page load from what I can see. The reason the smilies etc aren't working is due to missing the jquery cookie stuff in your overall_header file.

:wave: and welcome here

Yes it is possible but there is no benefit in doing so.

If vBulletin has a converter

There is no extension made as of today.

It will add what is missing and leave others alone.