I have been getting this error when upgrading to the most recent release:

Server Error in '/' Application.
Runtime Error
Description: An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed remotely (for security reasons). It could, however, be viewed by browsers running on the local server machine.

Details: To enable the details of this specific error message to be viewable on remote machines, please create a <customErrors> tag within a "web.config" configuration file located in the root directory of the current web application. This <customErrors> tag should then have its "mode" attribute set to "Off".

<!-- Web.Config Configuration File -->

<configuration>
<system.web>
<customErrors mode="Off"/>
</system.web>
</configuration>

Notes: The current error page you are seeing can be replaced by a custom error page by modifying the "defaultRedirect" attribute of the application's <customErrors> configuration tag to point to a custom error page URL.

<!-- Web.Config Configuration File -->

<configuration>
<system.web>
<customErrors mode="RemoteOnly" defaultRedirect="mycustompage.htm"/>
</system.web>
</configuration>

Sorry, too have taken so long to get back on this. I do not find any currentlg.config file in the data folder. In fact outside of the folders in the data file there are non like I have on my other sites.

I finally I have this issue fixed, but in so doing it and I needed help from David Neal, I now have another problem. My custom skin no longer works correctly and when I used the directions for modifying the skin it ended up with a big mess with things scattered all over. You said to replace this with the one that says combiner correct? <portal:StyleSheet id="StyleSheet" runat="server" /> When I changed it to the one you mentioned is when the problems started. When I went back to the old style sheet above then the problems were just minimal. Let me know what information you need and I will see if I can get it, thanks