I have contacted support about this and the support rep was able to replicate the problem. I just wanted to post on thwack to see if others are also seeing this issue and if anyone has a workaround.
All 3 of the 95th Percentile traffic rate reports under the Historic Traffic Reports group do not work in Report writer. They display just fine on the web page, but the SQL query hangs in report writer.
Here is a screen shot:

The report just sits here like this and never completes.
This also henders you from making modifications to the report. If you modify the sql code, then try to click the "field format" or "report grouping" tab, it has to run the query in order to see the new fields. Since the query never completes, you cannot modify the field format of grouping. The report on the website will display any changes that you made to the sql code, but there is no way to format it, other than sql formating commands.
Any recommendations or work arounds.