A link to what? I'm willing to look at error messages and give you pointers as to where the problem is (since I can do that while I'm at work), but I don't have time to dig through the code of and update addons I don't even use. :|
If you want to try fixing it yourself, download versions of GatherMate from before and after 3.1, and use a compare utility like WinMerge to see what changed. Then look through Tracksw and see if it called any of the functions that changed, and try to change them to match.
SmoothQuest's error is caused by the fact that the quest watch frame no longer exists, and was replaced by the new objectives frame. As a previous poster mentioned, it's likely that Ammo will release a working version soon.
I have no idea why an addon that changes your tracking type is trying to use something labeled "playerModel", but without looking at its code, my guess would be that it's affected by the 3.1 changes to the minimap API...