IDK if it's an appropriate way to fix that but adding "word-wrap: break-word;" to a:link class in global.css fixed the overlap in that post I linked...
Thanks Jhonn. I added that bit of CSS. Seems to work just fine

(12-12-2015, 06:53 AM)MaJoR Wrote: [ -> ]The default theme we're using is "Simpl".
I wonder if a newer theme might be more mobile friendly, or of MyBB is just like that. Hmm...
Thanks! Well, it looks like it would be hard to improve it significantly… And it seems that the situation is the same for most other themes. There
are responsive themes that use Bootstrap, but none of them are free
