First of all only use Phillips converter - it is slower but it is far more reliable and doesn't generate problems with render flags like the other!
What you need to do is this - put your files into Phillips converter... As tutorial says... And go...
Generate a new WDT for your map using the latest software you have, whichever tool - the wotlk one rarely works...
The only other file you need is Tex and MDL? (Ref tutorial I forgot) - these are generated with WDT tools - make sure you use your new WDT to generate these.
Compile in a patch and GG...
Always use a clean map when testing with either old objects in or little stuff changed - because it's better to ensure you can covert before you waste your time and find out you can't so do a test map to learn first...
Extra:
You may need to update server DBC!
If you get server kick - it's probably render flags - try lowering graphics and see if it works - if it works then re-convert...
3) your maps and DBC should stay in enUS locale - trust me it seems to work better
Ghaster very kindly helped teach me to convert - and because of this I will help you if needed - PM for Skype IF required.
