Crashing for me too during character creation with the following message box: "Fatal Error: Error decompressing data." I've run the client multiple times and, after STO verified all the files, it crashed again the same way in the same place.
update from my end: as I said it was downloading on steam for the 2nd time. I copied the star trek folder from steam to back it up, and now ran it. And I didn't get this bug! It was getting the patch of 59mb and Im now selecting my character.