Yes, still doesn't work. I had followed the instructions in the guide in the Resources section, which are equivalent, although the page you linked is a better presentation.
So I went back into Twitter, deleted the application, and started over following your instructions. And it still doesn't work.
This is on a site that was a clean install of 1.3.1 (not an upgrade) earlier in the week, only mod is Xenique's DXF Blue style, no add-ons. It passes the File Health Check.
The response from the "Test Twitter Integration" option on the site's Admin/Tools page is:
Test Twitter Integration said:
Twitter returned the following error: Could not retrieve a valid Token response from Token URL: Failed to validate oauth signature and token.
I tried it on a different site that I upgraded to 1.3.1 from 1.2.x a few days ago, also with DXF Blue. Twitter integration works just fine on that site.
Have to upgrade another site yet tonight, will see if Twitter wants to work on that one.
The first reference I see on Google relates to the server clock being wrong. I'd check that. Is the site that works on the same server?
In general, the process to create the signature is handled by a library so I would expect it to be wrong for significantly more people if it was a bad calculation there.
Will get that submitted as soon as I can. The site where it didn't work is just a concept to play with for a while. I tried the Twitter affiliation out there hoping to get it down before I upgraded that other site over the weekend.