If I turn off your vb
enhanced integration things load fine so the issue is related to your vb
maybe a plugin can not respond though because the admin login you gave me is invalid so hard to comment further than just verifying a path.
I know the classifieds works all our products use vb4 and work fine with the default product we know that vb4 is 3 years old.
what happens if you turn off the plugin system and load the enhanced integration? what happens if you use the enhanced integration with the default vb
I know you have changed servers as the last time I looked at your site the server information was not this.