While replying to some questions, I found that if the thread was longer than my screen, the Jive window would "jump" up to the top of the OP. I had to scroll down to continue. Doesn't happen all the time and I didn't see any triggers (e.g. a line wrap, a return, a capital letter, etc.).
Mac Sierra (10.12.6)
Chrome Version 61.0.3163.100 (Official Build) (64-bit)