ELMAH in ASP.NET MVC 4 app in subfolder - asp.net-mvc-4

Question

Setup:
I have an ASP.NET MVC 4 app in a subfolder of the root folder (~/tracker).
I have ELMAH installed in the MVC app using NuGet.
Dev Machine:
On my dev machine the website is at the root. ELMAH works fine.
Problem on the Server:
On the server, I can see the ELMAH page, but despite generating errors, no errors get logged. It just says: "No errors found".
It also appears without any styling.
Web.config on Server:
The Elmah relevant bits on the server web.config are:
configSections:
<sectionGroup name="elmah">
<section name="security" requirePermission="false" type="Elmah.SecuritySectionHandler, Elmah" />
<section name="errorLog" requirePermission="false" type="Elmah.ErrorLogSectionHandler, Elmah" />
<section name="errorMail" requirePermission="false" type="Elmah.ErrorMailSectionHandler, Elmah" />
<section name="errorFilter" requirePermission="false" type="Elmah.ErrorFilterSectionHandler, Elmah" />
</sectionGroup>
appSettings:
<appSettings>
<add key="elmah.mvc.disableHandler" value="false" />
<add key="elmah.mvc.requiresAuthentication" value="true" />
<add key="elmah.mvc.allowedRoles" value="Admin" />
<add key="elmah.mvc.route" value="tracker/elmah" />
</appSettings>
httpModules:
<httpModules>
<add name="ErrorLog" type="Elmah.ErrorLogModule, Elmah" />
<add name="ErrorMail" type="Elmah.ErrorMailModule, Elmah" />
<add name="ErrorFilter" type="Elmah.ErrorFilterModule, Elmah" />
</httpModules>
system.webServer:
<system.webServer>
<modules runAllManagedModulesForAllRequests="true">
<add name="ErrorLog" type="Elmah.ErrorLogModule, Elmah" preCondition="managedHandler" />
<add name="ErrorMail" type="Elmah.ErrorMailModule, Elmah" preCondition="managedHandler" />
<add name="ErrorFilter" type="Elmah.ErrorFilterModule, Elmah" preCondition="managedHandler" />
</modules>
</system.webServer>
Finally:
<elmah>
<errorLog type="Elmah.XmlFileErrorLog, Elmah" logPath="~/App_Data/Elmah" />
<security allowRemoteAccess="yes" />
</elmah>

Answer 1

ok, solved this one:
Add write permissions to the ~/App_Data/Elmah folder.
As the meerkat said, simples.
I solved it by finding the following SO answer:
Elmah.MVC does not log errors in production environment
There is also a guide for setting permissions on the ELMAH folder, or rather, a link to a guide in the accepted answer to that question.
What I can't get to work is the styling of the ELMAH pages. Any suggestions?