When commiting I got this error in the console ans the commit was not done
Internal error occurred; see file ERROR.LOG for details
(error.log has this entry:
v6.3.0 2010-04-30 16:48:02 Access violation at address 04931A7B in module ‘sqlnavigator.exe’. Read of address 00000000
I then made the commit by script and the data was commited.