Solved the problem!
Accell has released a firmware update for a couple of their DisplayPort dongles. Unfortunately the link is a bit buried in their support / faq section:
http://www.accellcables.com/support/FAQDP.htm
I was not aware it was even possible to modify the firmware of display...
I am having the same problem with the same dongle (Accell DP-DVI SL Active B087B-005B).
My configuration is three monitors (two 22", one 27") in extended desktop mode on a ATI 5770.
My OS is Windows 7 64-bit using Catalyst 11.1.
No matter what monitor I connect to the dongle...
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