Malcolm,
I find that the flickering is worse when I am updating share prices.
This can vary, by selecting different "Show:" screens.
"Historical Performance" is extremely slow
"Price Update" is much faster as long term stats are not presented.
Do you find a similar response ?
Not sure how to reply to Rav (I am new) but I turned my desktop to solid colour rather than the revolving photos I had on there, and my flickering problem has gone away!