I got the latest versions of both ERG and LKB-Fos for OSX.
(1) On some parse attempts (in this case, I tried “This sonata is easy to play.” though I’ve seen this with other sentences), I see:
Sometimes I do not see that though. For example, “Cats chase dogs.” works fine provided I don’t forget the period. If I forget the period, it is “No parse” but no error.
(2) The punctuation used to be optional, no? (Not that it’s a problem.)