Without elaborating, Twitter has just posted a help document titled "I'm Having Problems Logging In to UberTwitter or twidroyd" that gives little hope for an immediate fix: turns out the company has outright suspended both apps -- among the most popular Twitter apps for the BlackBerry / iPhone and Android platforms, respectively -- for "violating [its] policies." They go on to say that they suspend "hundreds" of apps on a daily basis for policy violations, but decided to call out these two in particular because of the high number of users potentially affected. Considering the popularity factor, we imagine this'll be solved one way or another before too long -- but in the meantime, you might want to fall back to the official apps for all three platforms.
[Thanks to everyone who sent this in]
Update: We've received a statement on the issue from Twitter, which says that the violations here "include, but aren't limited to, a privacy issue with private Direct Messages longer than 140 characters, trademark infringement, and changing the content of users' Tweets in order to make money." Follow the break for the full text.
Update 2: Pocket-lint says that Echofon is also suspended. Things are getting pretty serious here.
Update 3: UberMedia -- which owns UberTwitter, Twidroyd, and Echofon -- has said that it has "completed the changes, and new apps are currently being posted to their respective stores." They've apparently gotten an assurance from Twitter that the apps will be flipped back on as soon as the changes are live. Oh, also: UberTwitter will become UberSocial, which must be the "trademark infringement" Twitter was referring to.