Hello Shaun Mitchem,
We tried to reproduce the problem with IIS7 and II6 as well with no avail using Sitefinity 3.7 SP1. Could you tell us
- which version of Sitefinity you use
- Which version of Windows you use
- Which version of IIS you use.
- How IIS permissions are set ( if you can provide us with a screenshot it will be great).
Temporarily solution could be using QueryString as persistenceMode - the language is appended as a QueryString.
I look forward to hearing from you at your earliest convenience.
the Telerik team