When you disable the TV plugin, the 'Test connection' button in TV Client part, still checks and brings error messages though you do not want to use TV/Radio. Preferably it checks if TV/Radio plugin is enabled, and only check if 1 is enabled. Same for the connection check which is done on closing the config tool.

h4. Steps to Reproduce
1. Enter wrong hostname
2. Disable TV Plugin and Radio plugin
3. Hit "Test configuration" button or
   hit 'OK' to close config
4. You get an error message

h4. Additional Information
Comment from Michael:
http://forum.team-mediaportal.com/threads/bug-4216-mp-has-problems-accessing-the-tv-server-database-on-fresh-installations.116134/page-5#post-967196