Just in case anyone is thinking about trying the new (free, "never expires") NEO HDV player from Cineform, don't.
I just have tried it and it screws up a lot of things. In Vegas it will overwrite the render dll with a playback only one which means you will get an error message when trying to output via the cineform intermediate from within Vegas.
If you have AE or Premiere you may get this - it installs the QT cineform codec so when it loads I get a pop up about the Cineform license being expired.
I emailed David (_dan_) about this to see if it is an issue that could be resolved.