Second person in workflow no rights to document from a userworkspace

Hello

If i make a workflow and the document stands in my userworkspace, the user opening the workflow from his tasks gets this error http://pastebin.com/LGun0J3W

I logon as user and go to my personal workspace.
Open a document and select the workflow tab.
check the Approval workflow and Approved (minor version) radio-buttons.
Select a second user and give him/her write rights, Click on Add and start the workflow
Logon as the second user and go to My Tasks.
Click in My Tasks on the workflow-task

when i uninstall hotfix 3 the problem is gone. it looks like access rights cos the file is in an userworkspace.

regards.