JSp pages only show on port 8080 after upgrade to 2.3.7

Hello,
I have just upgraded my production environment to 2.3.7 and now the jsp pages only show the html, rather than the compiled page. If I add the port to the end of the URL they show correctly, ie http://www.someplace.com:8080. I have checked the release notes but could not find any information relating to this. Maybe there is a configuration change needed to make this version work which needs documenting.

Cheers Greg