Delete DM in Twhirl triggers overlimit warning and pause

When clicking the delete icon on a direct twitter message in Twhirl, I get the "Rate limit exceded, pasing for 5 minutes" message. Initially I thought this was due to having twhirl and socialthing going at the same time, but after shutting down socialthing, and waiting a couple of hours, and dropping the twhirl api request rate to 10/hour, I get the same thing.
Also, when hovering over the API health icon, it tells me that I've used (for example) 15 of 100 requests.

I think this may be down to the CSRF protection twitter added recently.