@Ramburner 

An "x"  means one of three things.  1. Its a flase positive and if you tap on the clip it will still play.  2.  There was an issue that occured when the clip uploaded to the cloud and it is unretrivable. 3.  There is an indexing issue and it might be retrievable.  We would need to know your Kasa acccount email address though.  Is it the same one you used to register here on the community?  Also please provide us the error you received when trying to play the clip.  

@Carl I deleted them all. There was no error message, they would not play at all.

@Ramburner 

By error message i mean a message that appeared when you tried to play the clip. 

@Idaho i have X too.....on most of all the videos....every now and then, it is recording.  how do we get rid of the cloud?  is TPLINK going to fix the issue? 

@Carl  i am having SAME issue.  they told me to delete and restart.  NOTHING HAS WORKED.....I HAVE AN X ON EACH video.    NO HELP at all from the TP LINK 

@Ramburner I'm sending pics of my settings ect to them and trying to fix this.  It sucks when everything was fine until I gave them payment for the cloud service.  If they don't fix it I will cancel the Cloud.  I suggest you contact tech support, maybe they will understand that I'm not the only one having this issue. Good luck. 

@Ramburner 

I have the same issue.  What was the fix?  The clips have an X over them and when you click it is says "Activity in Progress:  Your camera is still recording activity.  check back later to play this clip."