I have found on three of my devices, that I am no longer able to reply more than once to a thread without hitting the refresh button. Once I refresh all the posts will go grey and I prefer not to sift through all the dates to figure out which ones to re-opn. Basically the Reply button is only there once. I can reply once and then when I type a reply to another post in that thread in the same reading session, I can type the whole thing but then there is no reply button to submit.
On the PCs (using both Internet Explorer and Firefox) this isn't as much of a hassle if I open a word document and copy and paste and refresh but on the iphone 4 (old operating system) it basically is a waste of time.