Based on recent Skype customer community posts and our own investigation over the past couple of days, we have identified a bug that we are working hard to fix. This issue occurs only when a user's Skype client crashes during a Skype IM session, which may in some cases result in the last IM entered or sent prior to the crash being delivered to a different IM contact after the Skype client is rebooted or logged in as a new user.
Although we cannot determine precisely how many users may have been affected by this error, we believe the number is small given the very specific circumstances under which the error occurs. At Skype, our customer experience is paramount and we are working hard to release fixes for impacted clients within the next several days.
The Skype clients impacted include: Skype 5.10 for Windows, Skype 5.8 for Mac, Skype 4.0 for Linux, Skype 1.2 for Windows Phone. We urge all Skype customers to download the latest client as soon as they are notified that any update, including this fix, is available.
We sincerely apologize to our community for any inconvenience.
[UPDATE July 17, 2012 - 2:00 PM GMT] Hotfixes for Skype for Windows (version 184.108.40.206) and Skype for Linux (version 220.127.116.11) are now available. They can be downloaded from www.skype.com/go/downloading.
[UPDATE July 19, 2012 - 3:45 PM GMT] Hotfix for Skype for Mac (version 18.104.22.1687) is now available. It can be downloaded from www.skype.com/go/getskype-macosx.dmg.
[UPDATE August 2, 2012 - 4:20 PM GMT] Hotfix for Skype for Windows Phone (version 22.214.171.124) is now available. It can be downloaded from http://www.skype.com/intl/en/get-skype/on-your-mobile/download/skype-for-windows-phone or by visiting the Windows Phone Marketplace on your Windows Phone.