FL5 works for me flawlessly on my computer 2ghz Dell lappy with TurtleBeach Advanced Micro USB sound device and ASIO4ALL drivers.
FL6 crashes, locks up, and makes awfull howling sounds with the cpu spiked permenently at 100%. Been through the 'try every one of 4 million various sound setting permutations' routine to no avail.
My reports to techsupport 'dissappear...' so much for tech support.
Imagelines respons so far in the forums has been to point fingers at the customers for using ASIO4ALL.