"Remember me" on login not working

[Webrunner]

Hi everybody,

I have a quite a big forum with quite some mods installed.
The problem i am having is this: The "remember me" function is not working.
I have played around with just about every cookie setting possible.

Of course vb.com tells me to switch off all mods and return to the standard skin and reupload all files.
Because my site is very busy i really want to try to solve this without these actions which results in a long period of unavailability of the site.

Anyone ever had any problems like this with a specific mod?

Kind regards
Webrunner