After you install the Microsoft Forefront Threat Management Gateway 2010 TMG Service Pack 1 (SP1) Update 1 on non-English TMG 2010 installations, the non-English TMG 2010 servers do not correctly generate report logs and historical logs. When you generate a report the report will not contain any data.
This issue occurs because of a problem in TMG SP1 Update 1.
To resolve this problem, install the service pack that is described in the following Microsoft Knowledge Base article:
2555840 Description of Service Pack 2 for Microsoft Forefront Threat Management Gateway 2010
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates