Hi Bernd, are you saying you can't even read the thread, or you can't reply to it. If the latter, that is because the TI-RTOS forum was made Read Only as of May 11th, 2017.
If you cannot even read the thread, then I'll have to check your roles within E2E. I did try to find you in E2E but cannot seem to. Can you tell me what email address your E2E account is associated to? If I search for your AID, I do not find you.