We have detected an issue that is affecting Skype in a number of ways.

If you're signed in to Skype, you will not be able to change your status and your contacts will all show as offline even if they are online. As a result, you wonít be able to start Skype calls to them..

A small number of messages to group chats are not being delivered, but in most cases you can still instant message your contacts..

If you arenít signed in to Skype, you may be experiencing difficulty when attempting to sign in. Any changes to your Skype account such as your Credit balance or your profile details might take a little while to be displayed..

You may also have difficulty loading web pages on the Skype Community. For that reason, please check back here for future updates..

We're doing everything we can to fix this issue and hope to have another update for you soon. Thank you for your patience as we work to get this incident resolved.

Source: Issues with Skype status and calling - Heartbeat