If you've been having trouble using Skype, you're not alone. What is being described by the Skype team as a "global incident" has been causing downtime with the service since late on June 19 (via TechCrunch).

'Global incident' causing Skype connectivity issues

In a June 19 post on its Heartbeat blog, which reports service issues, Skype wrote:

Hello, we are aware of an incident where users will either lose connectivity to the application and may be unable to send or receive messages. Some users will be unable to see a black bar that indicates them that a group call is ongoing, and longer delays in adding users to their buddy list.

An update to the post from 7 a.m. GMT on June 20 states that the service is still experiencing issues.

According to Downdetector, the vast majority of issues seem to be concentrated in the U.K. and Europe. User reports appear to have tailed off slightly in recent hours, but the outage appears to still be ongoing.

It's unclear precisely what is causing the outage, but Panda Security has indicated that a DDoS attack could be behind the problems. Skype has yet to confirm a cause, however.

We'll update this post with more information as it becomes available.

Update June 20, 2017: Microsoft has updated its Heartbeat page to note it is seeing improvements, but some users are still affected.