Make sure that all pop up blockers are configured - it could be that an auto update has run on your firewall or any other blocker you have which has now caused this behaviour. I would suggest that you temporarily disable all pop up blockers and try again to see if this is the cause.
I've just tried to access the Traders Room which as a Shares Magazine subscriber I've been able to do for the last 18 months or so and received a message that my subscription does not give me access to this feature
On futher investigation my account shows me as a free account not Premier which I believe I should be given my Shares magazine subscription