hi schrullenhaft,
thanks for that in depth advice. sorry about delay in posting but had a heavy weekend. have tried everything you suggested but still no luck. CMBB is also crashing everytime (unmapped memory exception(?)), have also tried re installing CMBB, think i will have to use my flatmates iMac for now. he'll be pleased(?).
if you have anymore ideas , that would be great, but i feel defeat looming. shame 'cos I won't be able to buy full version. will keep trying though.
thanks again