Get dialog box stating "Cookies must be enabled" on login

[adders]

Hello All

 

My site is powered by Joomla but no one can help on the Joomla forum, I did manage to work out that it may be a permissions or none Joomla issue that is causing my problem though.

 

I recently moved my site from one server to another and  now I get a dialog box pop up when I try to log into my site.

 

I run a Warhammer hobby site Astronomican.

 

It only happens on the first attempt and when I click login again it always works fine.

 

Feel free to register on my site to test this out for me, let me know your username and I'll delete your user afterwards.

 

Any ideas?

 

BTW - Cookies are enabled on my browser, it happens to other users too.

 

Thanks