SMS updates are failing for all keywords (while private messages do work)

SMSes are not coming through in a reliable way. I've removed my phone and added it again. I got the SMS back saying that my device is verified, and it also shows up on the Devices page.

I don't have a PIN set, and don't have sleeping hours.

However, I don't receive the SMSes with my keyword "spmwinkel" (my username). Direct messages do come through correctly. I tried to untrack spmwinkel, and then send "track spmwinkel" again. No luck.

I already created a topic about it earlier here:
http://getsatisfaction.com/twitter/to...

And we concluded that the problem was probably due to the same issue that is causing those updates to not appear on Summize and Tweetscan.

However, I never received a reply from Twitter to the topic or the e-mail I sent them, so the only thing I could think of was creating a new topic.