I dont have a Global.asax.cs file but it could be compiled into the binaries in the BIN folder. Did you install using the installer or the source code ??
Did you also try giving the application an Application Name in the web.config (I do this through the IIS add-on cause I dont know which section it needs to go into).
If you do change the application name, remember to change it in the ASPNET_MEMBERSHIP tables as part of the ASP.NET membership provider (sometimes it works without changing).
<add name="AspNetSqlMembershipProvider"
type="System.Web.Security.SqlMembershipProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
connectionStringName="LocalSqlServer"
enablePasswordRetrieval="true"
enablePasswordReset="true"
requiresQuestionAndAnswer="false"
applicationName="BugNET"
requiresUniqueEmail="true"
passwordFormat="Encrypted"
maxInvalidPasswordAttempts="5"
minRequiredPasswordLength="7"
minRequiredNonalphanumericCharacters="0"
passwordAttemptWindow="10"
passwordStrengthRegularExpression=""/>
and
<providers>
<clear/>
<add name="AspNetSqlProfileProvider"
type="System.Web.Profile.SqlProfileProvider"
applicationName="BugNET"
connectionStringName="LocalSqlServer"/>
</providers>