SHAREPOINT 2013: WORK MANAGEMENT SERVICE & ERROR „SORRY, WE’RE HAVING TROUBLE REFRESHING YOUR TASKS. CONTACT YOUR ADMINISTRATOR IF YOU CONTINUE TO HAVE PROBLEMS“

I have deployed SharePoint 2013

Created a WebApp root.demo.com with service account: demo\web
Created Site Coll: portal.demo.com & mysite.demo.com
Created UPS with service account demo\ups
Created WMS with service account demo\wms
Created Search with service account demo\search

All works wel, MySites are being created.
But when a user goes to his MySite clicks on Tasks in the bottom i get the yellow warning triangle stating: "Sorry, we're having trouble refreshing your tasks."

What i tried to fix by several blogs and posts on internet:

- as per: http://blogs.technet.com/b/praveenh/archive/2013/08/22/work-management-service-application.aspx

 

$w = Get-SPWebApplication -Identity root.demo.local
$W.GrantAccessToProcessIdentity("demo\web")

- as per: http://social.technet.microsoft.com/wiki/contents/articles/12525.sharepoint-2013-work-management-service-application.aspx

Grant the account that the Work Management service is running as "Full Control" to the User Profiles Using "administrators" button on the ribbon
Grant the account that the Work Management service is running as "Full Control" to the User Profile service using the "permissions" button on the ribbon
Run the powershell command to grant content access to a process account to the MY SITE web application:
$webApp = Get-SpWebApplication root.demo.com
$webapp.GrantAccessToProcessIdentity("demo\wms")

- Restarted the server, iisreset, full crawl UPS, full crawl search 

All don't make the warning go away

Please help