HTC has released this hotfix to fix the GPS issues with the Touch Pro. I've never had a big issue to get a fix on a cold start. I always use GPS Test first, then start Tomtom. This works best for me. I know reading through xda-developers that a lot of people have issues with GPS, I may have been one of the lucky ones or may not be too bothered about it.
Hotfix for resolving difficulties finding or locating a position when using GPS for HTC Touch Pro
If it is difficult to find or locate a position when using GPS, please download this hotfix to solve the problem.