Confused with versions and features: which one is working? 6.x-3 can't add accounts and 6.x-2 cant post to twitter

Hello,

I'd like to use this module but I am experiencing problems with it since none of its two versions (6.x-3beta3 and 6.x-2.6) work fine:

Twitter version 6.x-3.0beta3 + OAuth module version 6.x-2.02
That's what I did:

1. Enabled the two mentioned modules
2. Visited admin/settings/oauth and set cryptography to RSA-SHA1 (I also tried with HMAC-SHA1 since twitter stats that their apps support this setting)
3. Registered applicatin via https://twitter.com/apps/new with the following settings:
-Application type: Browser
-Callback url: http:///twitter/oauth (I made sure to replace with the name of my current domain)
-Default access type: Read&Write
-Yes, use Twitter for login (set to true)
4. Visited admin/settings/twitter and Copy-pasted oauth consumer key and oauth secret key
5. Visited user/%/edit/twitter (replaced % with the uid) and added account.
6. I get redirected to twitter.com and asked to grant permissions, so I accept.
7. Twitter redirects to previous page, but the account is ignored and I am only promted to add an account. I can repeat this process with no success at all.

I only made it work by reverting to 6.x-2.6, as described here: #959166: Clicking 'Add account' results in blank page

Twitter version 6.x-2.6 + OAuth module version 6.x-2.02
So, one may think that if I succeded with that version, I should keep using it, but I also found other problems:

-whenever I type twitter's account password I get a "wrong password" message
-I can't post nodes to twitter: I get a "authentification failure" message, and the post is not added. (I updated to 6.x-3.beta3 and I can send nodes to twitter, but once again I can't add any more account to any user)

As you can see I am completely lost at this moment: there are two versions and both are half-working, which results in not being able to accomplish what module description says.

What can I do?