Ah if you're using ApplicationPoolIdentity that is different than Network Service! :) 

http://geekswithblogs.net/ProjectLaws...

this might help, but I think a reply in the queue says you already have it working

Well, I thought I had them working.

Having just tried to do a few updates on my sites, I'm finding that I'm getting errors when trying to save changes in the HTML sections.

Here is an example
Error: is currently unavailable.
DotNetNuke.Services.Exceptions.ModuleLoadException: Deleted 0 files, however, some files are locked. Could not delete the following files: E:\Inetpub\wwwroot\NEDR-Web\Portals\0\\Cache\Modules\65_ACABA51644A302FBB325E30E7931BAF8.attrib.resources;E:\Inetpub\wwwroot\NEDR-Web\Portals\0\\Cache\Modules\65_ACABA51644A302FBB325E30E7931BAF8.data.resources; ---> System.IO.IOException: Deleted 0 files, however, some files are locked. Could not delete the following files: E:\Inetpub\wwwroot\NEDR-Web\Portals\0\\Cache\Modules\65_ACABA51644A302FBB325E30E7931BAF8.attrib.resources;E:\Inetpub\wwwroot\NEDR-Web\Portals\0\\Cache\Modules\65_ACABA51644A302FBB325E30E7931BAF8.data.resources; at DotNetNuke.Services.ModuleCache.FileProvider.Remove(Int32 tabModuleId) at DotNetNuke.Entities.Modules.ModuleController.SynchronizeModule(Int32 moduleID) at DotNetNuke.Modules.Html.HtmlTextController.UpdateHtmlText(HtmlTextInfo objHtmlText, Int32 MaximumVersionHistory) at DotNetNuke.Modules.Html.EditHtml.cmdSave_Click(Object sender, EventArgs e) --- End of inner exception stack trace ---

On only one of my sites can I edit text items without any problem.

Finally resolved the problem !!

I discovered that each site needs to have it's own application name added to the permissions not the "DefaultAppPool" user.
So, a site who's name is "Mysite" with an application name of "Mysite" needs to have the user "IIS AppPool\Mysite"  added to the permissions for the site; 

The important thing is that, if the computer is part of a domain, you must change the "Locations" option to that of the local machine name before typing in the IIS AppPool\Mysite username. If you don't the user will not be found.

It is important to ensure that this "user" has full premissions to the site before trying to browse the site after applying the upgrade files.

This also fixed the problem I had trying to re-install the forums module.

It's easy when you know how !!!