Hello Trond, i have open a BUG in the tracker and sent them the database script. I don't know if it is related to the number of objects in the database, but i have repeated the process 3 times with the same results.

I have installed on my machine FB 1 on port 3050, FB 2.1 on port 3052 and fb 2.5 on port 3053.

I have tested the database on another machine with only FB 2.5 installed and everything runs fine.

I can't understand where the problem is, but is strange.