Hello,
If your experiencing the Load Freeze in the Tiger Challenges and/or any course you play here is a temporary fix for the issue until a Patch comes out.
The problem is the interface between your Hard Drive (HDD) and the game. If you own a memory card or choose to buy one (39.99).... Simply copy your Tiger game files to the memory card along with your GamerTag info (This can be captured as well on the memory but takes a little bit of time.)
Once the files are on the Memory card, Turn off your xbox.... detatch the Hard Drive... Have the memory card in and start your game. It should now be running smooth as silk.
A patch is being developed to solve this problem and is one of their Top Priorities right now as the issue is expanding. There is not a definite date, but you can assume with in the week (Ill go ahead and cross my fingers now). It is up to you if you want to buy a memory card or not, but the purchase may be of some use to you in later games or traveling.
Hope this helps....
Late,
The Guru