After just updating my iPhone 6s to iOS 10 there is a nasty bug which visually whites out any OmniOutliner entry content after a URL link. It has to do with the styling actually, so to fix it I must blindly try to select my link and then use the Clear Custom Style button that hides at the very bottom of the Customize Style window. Then the content is whited out (during editing) at the next URL in my entry, and so on.
I keep long single entries with lots of inline images and URLs as notebooks so this is a ridiculous bug that suddenly destroys my productivity wherever I have included a link let alone dozens of them in an entry.
The app crashes all the time too when backgrounded for more than a minute, which is bad enough, since I lose my place. Please fix this ASAP as I’m amazed you didn’t catch this with what I assume is your beta iOS 10 for developers.
Since it’s a styling issue of some sort, newly typed or pasted URLs are fine so it’s not possible to reproduce from scratch. Copy/paste retains my old default URL styles so that doesn’t fix entries.
I also notice that if I manually edit an old URL it retains the original link inside, even if I then cut it and Paste Plain it back in so there’s something odd instead of desirably simple about your URL system. Again, if I clear styles it fixes this oddity too and the edited URL works normally instead of follows a ghost.