Try to copy the serial number and paste it in the registration box.
After you enter the serial number, press the left and right arrow keys to move the cursor back and forth.
If you have a serial number with what looks like a 1 in it, try using a capital "i" instead.
It's worth adding that the actual process of communicating with DivX's servers and getting the application to actually register takes some time, i.e. it's not 'instantaneous'. I had to try a few times, then wait a bit, and, eventually, after a few minutes, the application appeared as fully registered, and the 'Pro' label appeared everywhere :-)
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