Xray problem

So... I wanna play in server the got buildcraft + use xray in it, but when I install the xray and go to ssp or smp my minecraft crashes and goes blackscreen so I can't get error report. :S I've tried loads of xrays but none seems to work, except if I use hackclient, but I can't make smp buildcraft work in it.

So, anyone know fix for crashing or can give me nyancraft xlient xray files that may work without nyancraft client?

i think xray requests modloader make sure you deleted META from minecraft