g1smd - 11:38 pm on Oct 20, 2012 (gmt 0)
Use the Live HTTP Headers extension for Firefox to investigate URL requests that redirect.
Alter the RegEx pattern in the internal rewrite to allow a trailing slash in the requested URL. Be aware that your URL structure now breaks the HTTP specs and that you'll need to be especially careful with all rules that internally rewrite. The rules must match only virtual folders in URLs and not requests for any real folders.