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[DesertedCake]

You've made a different change to what I said to do - I said after the first line, you needed the second line, you have instead replaced the first line with the second line.

So, this time, above:

var cookieSecureFlag = "{$mybb->settings['cookiesecureflag']}";

add

var cookiePrefix = "{$mybb->settings['cookieprefix']}";

 My forum is up to date; blackmarketgaming.net I added the second line of code after the first one and the issue still remains. 

[Matt]

Like other people, the change has not been applied.

This is an excerpt of your headerinclude:

var cookieDomain = ".blackmarketgaming.net";
var cookiePath = "/";
var cookiePrefix = "";
var deleteevent_confirm = "Are you sure you want to delete this event?";

The new line is not here.

I'm closing this thread as it's been hijacked by numerous people, most of whom currently have not followed the instructions and applied the changes correctly, and it's getting very hard to keep track of. If people are still having problems, please check you have followed all of the steps, and if you are still having trouble, please make your own thread.