What is it with the KLM website?

Every time I try to book a flight, the screen vanishes for minutes at a time during the transaction. Scroll down to see a flight... vanishes. Try to book a segment... vanishes. Enter credit card details... vanishes. Each time takes ages to re-appear. This has happened for months now and is driving me mad.

Don't come all 'it's a Mac thing' with me - although I am using a mac to (try to) do the booking, both with Safari and Firefox.

Help please (and no suggestions about changing computer please!)

Techno