I remember reading a few weeks back that some people were having issues when they used fast-travel or used the horse-drawn carriages outside each of the five major holds. I have played Skyrim for well over 150 hours and have yet to fast travel one single time. I've also never used the carriages. However, I'm strongly considering using the carriages. I'll still never fast travel. But before I do I want to make sure that nothing in my game is going to be negatively affected by doing so.

Have any of you that use the carriages to take you to the the major holds experienced any kind of issues with the game? If I remember correctly, one of the issues was something about messing up NPCs schedules. I can't remember for sure.