>> Hmm, it may be the message that is causing the trouble. Selecting a different message seemed to work. The one I want to print has a barcode in it. Perhaps it is too big.
If you're running Android 4.4, and tried to print via Google Cloud Print -- then Android's WebView (system level HTML rendering component) was involved. It's very, very buggy in 4.4, with random crashes and "exits" like that. Supposedly it's gotten better in Android 5.0.