Hello Andrew Booth,
Sitefinity requires that you should grant read and write
permissions for Network Service/ ASP.NET account over App_Data
is used by Newsletters module to generate a dll file when you request the module for the first time or in case you are making changes to the SMTP settings through the module. For all other folders Network Service/ ASP.NET account should have read permissions.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items.