I need to revisit iBatis support in general and at a minimum bring it in line with the DbProvider abstraction we are using.
The issue you are having is that iBatis.NET 1.2.x uses log4.net 1.2.0 and Spring.NET uses 1.2.9 (the 'beta' which has been out forever...) I just checked that iBatis 1.3.0 beta uses log4net 220.127.116.11
Anyway, If you add this rebinding section to your application configuration file the issue should be resolved.
Let me know if this helps you.
<assemblyIdentity name="log4net" publicKeyToken="b32731d11ce58905" culture="neutral" />
<bindingRedirect oldVersion="18.104.22.168714" newVersion="22.214.171.124" />