Serious Facebook authentication issues

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Hey guys, just got my G2x a few days ago and I love it, but Facebook has been giving me some serious problems with authentication.

Upon initial launch of the app, it asks for my credentials, which I supply, but then almost immediately a gray popup dialog looks like this:

/!\ Facebook sign-in

Please re-enter your Facebook password.

Username
(my email)

Password
(password entry field)

[ Sign in ] [ Logout ]

(Sorry, I don't have a screen capture app installed, but I doubt I'm the only one having an issue.)

I enter my password and I get a message saying "Facebook authentication succeeded". But then almost immediately after the message disappears, I'm prompted to re-enter my password again into the same popup dialogue.

Suggestions? Solutions? Any help would be greatly appreciated!

Edit: Also shows a very quick popup dialogue about "Session does not match the current stored session."

My Facebook works perfectly. Maybe try reinstalling it or doing a hard reset. Are you trying to connect some kind of weird way?

Btw, holding home and pressing power takes a screenshot.

Sent from my LG-P999 using XDA App

Have you updated Facebook's app? The one that came on this phone did have some bugs. I have had zero issues though.

See, the weirdest thing is that my device did not have Facebook preloaded on it. I had to download from the Market. It's up-to-date too. Version 1.5.4

I like on how the G2X is a pure Google phone (besides a few preinstalled T-Mobile apps) but I'm really lost about the Facebook issue.

Mine also did not have Facebook or Twitter preloaded

Sent from my T-Mobile G2x using XDA App

You could try to uninstall and reinstall the app.

Sent from my LG-P999 using XDA App

Excellent suggestions guys, but I tried it already. Should I unroot and try a hard reset?

Oh man. It's getting a bit out of hand. I was able to take screens and I'll try to upload them ASAP. The only option is to remain signed out of the app.

Major bummer...

Excellent news guys. I solved my own issue. It seems like the mobile app doesn't play nice with HTTPS (secure browsing) if you have it enabled on the Facebook website. After disabling HTTPS on the full Facebook website under Account Settings, I was able to log in and stay logged in without an issue.

Hazzah! I even called T-Mobile to get help and wound up solving the issue while being on the phone with them and now (thanks to me) they have documentation about the issue and how to solve it!

Helping the community by giving back! Viva la Open Source!