Hi Ori.
I've narrowed the problem down to the medium trust config that my shared host is using. See below.
If I use the standard medium and full trust then all works ok. But I am forced to use the medium trust configuration below.
And there is something in this configuration that doesn't like images being added to controls.
Any help is greatly appreciated.
Peter
<configuration>
<mscorlib>
<security>
<PolicyLevel version="1">
<SecurityClasses>
<SecurityClass Name="AllMembershipCondition" Description="System.Security.Policy.AllMembershipCondition, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
<SecurityClass Name="AspNetHostingPermission" Description="System.Web.AspNetHostingPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
<SecurityClass Name="DnsPermission" Description="System.Net.DnsPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
<SecurityClass Name="EnvironmentPermission" Description="System.Security.Permissions.EnvironmentPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
<SecurityClass Name="FileIOPermission" Description="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
<SecurityClass Name="FirstMatchCodeGroup" Description="System.Security.Policy.FirstMatchCodeGroup, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
<SecurityClass Name="IsolatedStorageFilePermission" Description="System.Security.Permissions.IsolatedStorageFilePermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
<SecurityClass Name="NamedPermissionSet" Description="System.Security.NamedPermissionSet"/>
<SecurityClass Name="PrintingPermission" Description="System.Drawing.Printing.PrintingPermission, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/>
<SecurityClass Name="SecurityPermission" Description="System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
<SecurityClass Name="SmtpPermission" Description="System.Net.Mail.SmtpPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
<SecurityClass Name="SqlClientPermission" Description="System.Data.SqlClient.SqlClientPermission, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
<SecurityClass Name="StrongNameMembershipCondition" Description="System.Security.Policy.StrongNameMembershipCondition, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
<SecurityClass Name="UIPermission" Description="System.Security.Permissions.UIPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
<SecurityClass Name="UnionCodeGroup" Description="System.Security.Policy.UnionCodeGroup, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
<SecurityClass Name="UrlMembershipCondition" Description="System.Security.Policy.UrlMembershipCondition, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
<SecurityClass Name="WebPermission" Description="System.Net.WebPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
<SecurityClass Name="ZoneMembershipCondition" Description="System.Security.Policy.ZoneMembershipCondition, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
<SecurityClass Name="ReflectionPermission" Description="System.Security.Permissions.ReflectionPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/></SecurityClasses>
<NamedPermissionSets>
<PermissionSet class="NamedPermissionSet" version="1" Unrestricted="true" Name="FullTrust" Description="Allows full access to all resources"/>
<PermissionSet class="NamedPermissionSet" version="1" Name="Nothing" Description="Denies all resources, including the right to execute"/>
<PermissionSet class="NamedPermissionSet" version="1" Name="ASP.Net">
<IPermission class="AspNetHostingPermission" version="1" Level="Medium"/>
<IPermission class="DnsPermission" version="1" Unrestricted="true"/>
<IPermission class="EnvironmentPermission" version="1" Read="TEMP;TMP;USERNAME;OS;COMPUTERNAME"/>
<IPermission class="FileIOPermission" version="1" Read="$AppDir$" Write="$AppDir$" Append="$AppDir$" PathDiscovery="$AppDir$"/>
<IPermission class="IsolatedStorageFilePermission" version="1" Allowed="AssemblyIsolationByUser" UserQuota="9223372036854775807"/>
<IPermission class="PrintingPermission" version="1" Level="DefaultPrinting"/>
<IPermission class="SecurityPermission" version="1" Flags="Assertion, Execution, ControlThread, ControlPrincipal, RemotingConfiguration"/>
<IPermission class="SmtpPermission" version="1" Access="Connect"/>
<IPermission class="SqlClientPermission" version="1" Unrestricted="true"/>
<IPermission class="WebPermission" version="1">
<ConnectAccess>
<URI uri="$OriginHost$"/>
</ConnectAccess>
</IPermission>
<IPermission class="ReflectionPermission" version="1" Flags="RestrictedMemberAccess"/></PermissionSet>
</NamedPermissionSets>
<CodeGroup class="FirstMatchCodeGroup" version="1" PermissionSetName="Nothing">
<IMembershipCondition class="AllMembershipCondition" version="1"/>
<CodeGroup class="UnionCodeGroup" version="1" PermissionSetName="ASP.Net">
<IMembershipCondition class="UrlMembershipCondition" version="1" Url="$AppDirUrl$/*"/>
</CodeGroup>
<CodeGroup class="UnionCodeGroup" version="1" PermissionSetName="ASP.Net">
<IMembershipCondition class="UrlMembershipCondition" version="1" Url="$CodeGen$/*"/>
</CodeGroup>
<CodeGroup class="UnionCodeGroup" version="1" PermissionSetName="Nothing">
<IMembershipCondition class="ZoneMembershipCondition" version="1" Zone="MyComputer"/>
<CodeGroup class="UnionCodeGroup" version="1" PermissionSetName="FullTrust" Name="Microsoft_Strong_Name" Description="This code group grants code signed with the Microsoft strong name full trust. ">
<IMembershipCondition class="StrongNameMembershipCondition" version="1" PublicKeyBlob="002400000480000094000000060200000024000052534131000400000100010007D1FA57C4AED9F0A32E84AA0FAEFD0DE9E8FD6AEC8F87FB03766C834C99921EB23BE79AD9D5DCC1DD9AD236132102900B723CF980957FC4E177108FC607774F29E8320E92EA05ECE4E821C0A5EFE8F1645C4C0C93C1AB99285D622CAA652C1DFAD63D745D6F2DE5F17E5EAF0FC4963D261C8A12436518206DC093344D5AD293"/>
</CodeGroup>
<CodeGroup class="UnionCodeGroup" version="1" PermissionSetName="FullTrust" Name="Ecma_Strong_Name" Description="This code group grants code signed with the ECMA strong name full trust. ">
<IMembershipCondition class="StrongNameMembershipCondition" version="1" PublicKeyBlob="00000000000000000400000000000000"/>
</CodeGroup>
</CodeGroup>
</CodeGroup>
</PolicyLevel>
</policy>
</security>
</mscorlib>
</configuration>