Little help? Import PS2 problem

[Ratso]

I received a US copy of Midway Arcade Treasures yesterday, and despite my chipped PS2 happily running the likes of WE7:I, Metal Slug 3 (both Japanese) and Disgaea (US). when I boot up MAT it doesn't trigger into 60Hz and starts up with a huge black border at the bottom like a totally unoptimised PAL conversion.
Also the sound seems to be skipping and popping somewhat.

Any suggestions as to why this might be, and how to fix the situation gratefully received.
I'm not 100% sure but I think that my PS2 was modded with a Messiah (2?) chip.

If there is no easy solution, will the US Gamecube version of MAT work with FreeLoader 1.06b?

Thanks muchly

[wod]

i think you have a rubbish inferior messiah 2 modchip in your ps2 as the messiah 2 will boot games into what ever ntsc or pal they are

[Ratso]

Yes, well as I say - I have several other 100% working, and fully 60Hz import games - this is the only one that's giving me any trouble.
Which is most odd.

[wod]

it must be the game as i have a messiah 2 machine and find that games boot correctly to ntsc or whatever. but if the ps2 is pal then they also have trouble playing the dance revlotion games cause they go out of sync