flashing

Everytime I am playing on certain maps such as esf_rosat, everything is flashing. The same problem appears on esf_riverside if I am underwater. If you can't imagine what I mean: (and now you have to imagine that every moment the blue/grey surface is somewhere else. I'm getting a headache...

can some one draw me a goten (teen) or gohan (teen) or GOKU (teen) or vegeta (teen) with short hair and electricity flashing around them i wanna see wich one of you have: -inivation -imagination -skill -brains k any one up to the chalange