"Requested funcionality not yet implemented"

Hi, everyone!
Today I have problem with opening project in Encore CS2 (running no WinXP SP2).
Project was created quite long time ago (with the same Encore CS2) and edited
almost every day (in CS2 only, no other versions have been used).
Today, I tried to open it but "Requested functionality not yet
implemented" message popped up and after pressing OK (only button that is
offered), it switched to default Encore opening menu. Computer restart doesn't
help.
And it doesn't matter, whether I'm going through File/Open or open Encore by
clicking on project file, the same message appears.

I have no idea how this could happen because few hours before this I recorded
coupe of demo DVDs from this project and everything was fine.
After burning discs, I saved the project, closed the program and turned off the
computer. Next time I turned the computer on, the first thing I did, was opening
that exact project to make some changes again and then this message appeared.
During the power off (for few hours) no-one has touched the computer, so there's
no possibility that someone could make any changes to project (removing project
files, assets or anything else) or do something to computer.

Is here anyone who had experienced the same problem and solved it?

It's very important because the project has many timelines with 5 subtitle
tracks which I created manually, so it would be really sad, if I have to
subtitle all that DVD again.

Or maybe there's any way how to add subtitles from one Encore project to other?

Hi Krishius!

Nope.
I tried to open it with Encore CS3 but the same message appeared.

Have you got any usb drives inseted in the system when you open a project..

People have been reporting erros in Encore trying to open stuff when a usb stick
is in the system.. causes problems.. just a thought!

Well, actually whole project with all assets is located on a USB hard drive.
(but no USB sticks were connected to system at that time).