This is because they added the currency description ("USD") to the hand histories and the tournament summaries.
v2.17.04G can be downloaded here:
http://s217900936.onlinehome.us/patch21704g.exe
For anyone that isn't able to see their data on the Ring Stats window, this is because the hands were importing with "USD" as part of the game level (a new game level was created - i.e. "$3/6 USD" instead of just "$3/$6").
If you want to correct your data, you need to use the Utilities > Database Maintenance and Options window to purge these sessions with the wrong game levels and then reimport your hand histories with the latest patch.