Hello Manfred Pohler,
You are correct. The latest Q3 2007 SP1 is version 188.8.131.52. Regarding the reported issues, the time between the issue reporting and the product release dates did not allow us to address them all for SP1.
You can find additional information in the support tickets you have opened.
If we can be of you further assistance, do not hesitate to contact us.
the Telerik team