AutomationContext.EditWorkspaceRecord hangs on most interfaces

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I created an IEventConsoleOpen addin that starts a TCP listener when the console is opend.
In the TCP connected-event we read the connecting URL (http://127.0.0.1:12345/TaskID=123), which contains the Task ID we want to popup.
This taskid is used to open the existing task:
var rec = _Globalcontext.AutomationContext.EditWorkspaceRecord(RightNow.AddIns.Common.WorkspaceRecordType.Task, taskid);

This works all fine in 1 interface. (customer.custhelp.com) When I start a different interface (customer_nl.custhelp.com or customer_uk.custhelp.com, etc...) the same code is executed, the task workspace is popping up, but the workspace keeps loading all the time. The code doesn't hang, it simply steps through every line of code, but the console hangs.