This can happen if using SSL and running in a sub folder, and the solution is to add this in user.config:
<add key="IsRunningInRootSite" value="false" />
Other than that note that the 2.3.7.0 release has been patched with several bug fixes since the initial release. If you look at the notes for the 2.3.7.0 release on codeplex you will see which files have been updated. So if you downloaded prior to these bug fixes you may want to download again and replace the specified files.
Hope that helps,
Joe