> about the index corruption, i deployed on our production server the FB 2.1.4 only 2 days ago (after another FB_inet_server massive hanging up). for now it's seam to work OK (around 200 fb_inet_server.exe running simultaneous), and if i see any probleme appear again i will come back to you !

Just to be sure - you used my custom build, correct ?

If yes, please, look at firebird.log - is it have messages such as

"BTR/garbage_collect : left page is released." ?

Regards,
Vlad