meh thats always been a pain that last few times i searched that the solution i was told is repair and update the client then repatch the files to connect ;/ i know it isnt much information but thats about it if u kinda goolgle xD
delete bin32 or bin64 "refer your os"repair client done...update your direct x to latest version..aion file about modified pak file also get crash to solve it jus restart pc if doesnt work overwrite the original pak file..ok this my experience how to solve crashing client..
Many thanks to you both \o/