[ubuntu] Triple boot with Ubuntu in external Hard Drive

Hi guys! I have a problem... and I hope someone can help me out here..

I had Ubuntu running on an external hard drive, and booting from my MacBook (with Lion) using refit was not problem at all. I had then to install Windows 7. I did so with BootCamp and everything went fine.... until I want to start Ubuntu again. It will show on the options of refit, but when I chose Ubuntu it then starts Windows. In refit documentation says that Mac doesn't support booting from external drives, but it had already worked for me! :(

Anyone have an idea what can I do next?

Thanks in advance!