Multisim seems useless...

Basically pretty much anything I simulate in Multisim doesn't work. It all just oscillates anything from hugely proven designs like DX blame, ESP P3A, my designs, very simple circuits like 555 timers won't work and just about anything you can thing of. It's very frustrating as Multisim could be such a good dev tool much I feel it doesn't really give a proper sim of the curcuit.