One minute it was fine (in fact I'd just played one of my most fun matches so far ), and then all of a sudden it started doing this when I closed the window and had next opened it and the program stops responding. I hope it's a fixable problem...
send to the address email you got your License Key from all files in "C:\Program Files\Tennis Elbow 2009\Profiles\Default" (replace "Default" by the name of your custom Profile, if u use one), compressed in .rar or .zip . I'll have a look at what's going on.
If you load the game in Slot J, does it crash as well ?