All logs are in (if default settings used) C:\ProgramData\McAfee\Endpoint Security\Logs - ask them to zip up the folder then have a look through. Web control has it's own log in there but it's worth combing through the others in case another module is disrupting the web app too.
ScriptSn....DLL is the ScriptScan option that you can disable under the Threat Prevention On-Access Scan policy. (it's right down the end).
Did you upgrade from VSE to ENS? More specific, Scriptsn.<somedate>.dll is the component from VSE which is handling the scriptscan functionality.
You can unregister the dll as described as workarround in following kb, but you might concider checking the sequence used to upgrade vrom VSE to ENS...