42 (?) If you have a document open, and you create a series of runtimes it will spontaneously close the document after a few runtimes. This appears to be sporadic. If you then continue adding runtimes after the document is closed, from time to time it will "hiccup" (i.e. it appears to hang for 30 seconds to 1 minute) after the addition of a few more runtimes. Again sporadic. Not really a showstopper, unless you have spent ages working on a document.