Different bug, so different post. You can't type numbers in the format 0.N in the max atmospheres field for terraforming. Well, you can, but it's... weird. You can't type "0.". The game won't let you. You can type, say "03" and then modify it to say "0.3", but... It's weird.
Also, if the number in that field is invalid (as it often is when you start typing something like .5 or .7), an exception is thrown.