If you paid for a Twitter client after August 2012, it's time to accept that you'll might eventually lose your $2
It's time to start facing the long, hard facts, folks. The writing has been on the wall for some 10 months now -- since Twitter announced the API v1.1 changes that would significantly change things for developers of third-party clients, essentially putting a hard cap of 100,000 new user tokens. (Twitter said "you'll need our permission if your application will require more than 100,000 individual user tokens," but it doesn't sound like it's granted that to any of the apps we use.)
Since that announcement last fall, we saw Tweet Lanes (and others) all but shut down. Falcon Pro debuted in November with that 100,000-token limit held over its head, and it ran into that wall in February 2013. A new version was released a few days later, requiring users to buy it again -- and paying about a dollar more this time -- and starting that vicious cycle once more.
This week, Twitter shut it down. Regular users are pissed. The folks in the newly formed Falcon Pro beta community are pissed. It's not fair to users. But neither should it be unexpected.