Are you getting a login error? Check your system time (make sure its correct) and check to see if you're able to accept cookies. I'm not sure how different the user reviews and gallery are from the board but I think they're integrated enough to use the boards cookies. And from what I know there is no post requirement to post pics or write reviews. But then again, what do I know.
I'm pretty sure this is because of your cookies (or rather your rejection of them). You could try temporarily changing the entries in your user control panel to "Automatically login when you return to the site? (uses cookies)" and "Browse board with cookies?" and/or place TechIMO in your list of "Trusted Sites"