Browser problem or item mall problem ?

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Hey for some reason i cannot buy from item mall not to mention that i cannot post in official forums. Maybe someone had this problem before :
I log in on site then i go to item mall -> silk charge -> make payment then i select the amount i want and when i click again the make payment button it redirects me to log in screen again. Ooook... i put my account and pass again and it tells me that i am already logged it. When i press the confirm button it takes me again to the log in screen. If i press the home button it takes me to homepage but on top right corner it appears that i am not logged in.
Same thing goes with their forum when i try to post a topic. I log in bla bla and when i press the "new topic" button it takes me back to select the category i want to view from the main forum page...
This happens both with firefox and iexplorer. If anyone has any ideea on what`s going on... give me a response.
Btw silkroad page is the only page so far that does this. Other sites work with no problems.