Hi everyone, we have just released version
5.1.20.
TL;DR. Upgrade to 5.1.20 
This version has some very significant changes to the way we handle the way posts display.
These changes are going to have a dramatic effect on the performance and speed of the app over the long term.
BUT (there's always a but) we had to rebuild everyone from the ground up so there might be some mistakes in the way posts appear. If you see anything in posts that looks off to you, please report it here or let me know.
I think I've got it to about 99% done, so hopefully nobody will even notice a change. But if you do notice anything at all, please let me know and I'll be all over it!
This change also means that all version pre 5.1.20 will stop working soon. We will give it about a week of cross-over time, then once we are happy with 5.1.20, we will discontinue support for all pre-5.1.20 installations.
Thanks