@Apple,

If the Firefox tip doesn't work for (I don't know what browser you're using), then I want to ask something.. Since you play on two devices, I wonder if this is your scenario?

Logged in on phone doing stuff. Try to log in on computer, but the page just refreshes (seemingly). Confused, you log back in on your phone to be sure that you had the right password, and are able to log in.

If that is like what you did...have you tried logging in twice in a row from the MacBook? Like Krin said, you can only be logged into a single device at a time. So, your first login is "wasted" by logging out your other session and plopping you back on the home page ready to login (incidentally, Krin that might be an unintended bug?). At this point, you would be able to log back in from any device, but might have simply tried the phone first, thus recycling the problem.

It might be something more complicated, but I just had to throw that out there in case you hadn't tried it. xP

There are a lot of weird things with the sessions. I personally have no problem thought lol. I stay logged in until I log out. If I log in somewhere else I log right in without having to log in twice.

Unfortunately, there's a billion variables with that and it's hard to pinpoint what exactly is causing it and what I can do to improve it.

@Renavoid: I tried, and even tried multiple times on Firefox. It didn't work.

@Krinadon: Sorry for vanishing last night, I remembered a paper I had to finish for class today and went into panic-mode. I'm starting to wonder if the problem could be with my Mac? I just did a virus scan not too long ago, and after this started I cleared out the cookies, I'm going to download some more browsers like Lynx... is there anything else I could try? I'm fine using my phone for now, but I feel like I might miss out on some of the Week of Love events if I end up stuck like this... :c

EDIT:
@Jadzhia: Sorry, missed your post! Glad to know it's not just me. Give me a sec and I'll try what that link says...

EDIT the sequel:
Firefox is working now! Thank you so much! *dances gleefully and hugs everyone who posted several times over*

Yay. I'm glad that you were able to figure it out.

I use two different computers with different IP addresses and i sometimes have to log in twice......or three times
I don't think the different computers are the problem though It might have started doing it to me before i started using the second computer...