Known bugs/problems with 2.1:
 (Being here means they are known and will be worked on. I typically 
  release at least once a month. Check the web page regularly)
 
 * 5200 controllers still busted, the implementation is currently
   specific to the DOS version. Basically, 5200 ain't working.
 * If command line parameters for Machine type or OS are screwed up, then
   the user interface will probably not reflect the command line values 
   after the config fails to load.
 * Antic artifacting still not quite right (CTIA vs GTIA, text modes)
 * There is currently a problem in SIO with double density XFD's. Will
   be fixed. If you get "BOOT ERROR" try to find an ATR of the same image.