Check the xdf definition you used wether it contains the changed address by mistake.
I would rather guess it was done by you than by the checksum plugin, but you could
test this out.

Solution!
**********
i recieved this mail from salvatore just now:

"Hi, thanks for the hint. Setzi was right the problem with the rebooting issue was that byte being modified by the plugin due to a typo error in the code I fixed the issue and have an updated plugin ready for downloading on my site.

I'm working on a new release to implement better RSA support and hopefully it will be available in a few days..."


there we go, problem solved, now im off to recover the dead ecu and then its time to give it another shot.. with all changes made to a new and clean original bin this time.. again, thanks for all the help! 

carlossus: the xdf is very much a sloppy work in progress with lots of notes to myself, descibing how i was thinking when i put it together, but i will clean it up and share it here soon

i can verify that the MTX me7-2002 plugin now works correctly, but still have some issues with that RSA signature, salvatore told me he was working on improving the RSA support, and hopefully a new version could be release in the near future.

tonite i spent 7 hours in the car, on the road, with my laptop, and the result is one really kickass "stage 1" tune, with totally reconstructed fueling, boost, load, torque model, knock-control, and all safety features active.
ive also made some changes to the variable camtiming-system, which resulted in a very smooth and strong bottom/mid range.. this is lovely 

i had some problems with setzis logger tho.. it wont let me connect using my FTDI 232R cable.. not in com-port mode, and not using ftdi mode.. i must be doing something wrong here..
ive made an ecu-file from my original bin, and configured it, configured the logging variables, tested all different baud-rates.. slow connect.. fast.. still nothing.. am i missing something here? using the wrong cable?
a bit OT, but id appreciate any ideas..