"Newer version of the data format" error message after downgrade from TC8 to TC7

Hi,



I have a project  with distributed testing, created in TC7. I made a copy of the project before upgrading from TC7 to TC8.



Then, I upgraded from TC7 to TC8, on both my master and the slaves.



Then, I downgraded from TC8 to TC7, on all machines again.



I opened the copy of my project on the master computer, everything works as normal.



I export the code to the remote machines, everything works as normal.



I try executing the code on the remote machines, I get



[Cannot load remote project. [Newer version of the data format]].



Does anybody have any idea what's going on? Did not find anything in the help or on the web.



I have a demo in three days, so any help will be greatly appreciated!