Hi there,
I'm going to move this question and answer to the Testing and Trying out the forum area.
I'm sorry - I don't know which link you are referring to. Can you please link me to the referring post?
Regarding "flashing" in long messages - I get this as well. I researched it in various PHPBB forums and this is what I found.
Q: He ........ has problems with the screen flashing or rebounded via text boxes when posting or editing. I'm not entirely sure of these issues, so forgive me for not being able to explain them better.
A: This is a problem with IE8. If your user is using IE8 just tell him to use it in compatibility mode (or use Firefox or chrome) & his problem will disappear.
Will probably be a future (proper) fix in either an IE8 or a phpBB3 update.
It doesn't happen with Firefox, so if you would like to download firefox as a browser, that might be a better option for you.
BTW, we don't kick people off for legitimate concerns and issues with the forum. We've had issues with individuals complaining and taking focus away from the recovery here. I hope I was able to help you!
Whenever evil befalls us, we ought to ask ourselves, after the first suffering, how we can turn it into good. So shall we take occasion, from one bitter root, to raise perhaps many flowers. ~ Leigh Hunt