Quoting electronicpakrat

At present, if I log into the forums first I cannot view my wishlist, cart, etc. Instead of asking me to login again (that would at least have been nice), it just says my wishlist is blank (contains no items) which was quite misleading initially.<<

Hi
I'm not on Renderosity staff or anything but perhaps a temporary help to you would be to export the 2 Renderosity cookies then you wouldn't need to keep logging in again.

It sounds like you clear your browser cache each day, this means you must log in again.
Once your cache is cleared I'd visit the forums straight away and then the marketplace and login for each once more.
Don't visit any other sites.
When you've done this In IE - File | Import and Export, run the wizard and export cookies.

Just run the same wizard again to import the cookie file next time you want to visit then you won't have to log in again.
This might help anyway.