A recently discovered Skype bug is causing random chat messages to be sent to the wrong users. The bug was revealed a few days ago and, according to Skype, is affecting Skype 5.10 for Windows, Skype 5.8 for Mac, Skype 4.0 for Linux and Skype 1.2 for Windows Phone. The messages are sent to the wrong users only when Skype crashes in the middle of a IM session, a situation which can cause anything from a single message to a whole conversation to be sent to an entirely different user from the one you were originally chatting to.
Following the discovery of the bug, Skype has released a hotfix for the Windows, Mac and Linux versions, which you can download on the main Skype page.
Source: MakeUseOf
