This has happened to me twice, but I can’t recreate it on demand. The Text button doesn’t appear on the bottom of the screen when the Next arrows are visible.
At very short posts the TEXT button never shows up, but returning to the list then selecting the same post again the button becomes visible already. That’s the exact phenomenon.
Hmm, I have a build that I may launch later today that redoes the Text button entirely to be sticky. I fixed some other issues while working on that feature and it quite possibly addresses this. Watch the @newsblur twitter account for news about the beta.