Plenty of threads on this. Use the search function. I use IB's Mac version on a MacBook Pro. Or you can us Parallels, VMWare, Boot Camp and run anything on a Windows partition.
am using macbook ( UNpro ). Browser Safari 3.1.2 , Mac OS version 10.5.4... use optionxpress secure web hppS...Safari, webkit, camino, firefox mac...all tend to crash... google 'crash safari secure website ' and you will know what i mean... however later i use crossover... www.codeweavers.com then use explorer 6 to surf optionxpress secure website..no crash anymore and the problem solved... I suspect something wrong with JAva on MAc or Mac OS or both.. Good LUck