transcation lock time out when creating large review

Crucible's produce too many lock timeout exceptions. This will predominatly occur while someone is creating a very large review

i found that when i creating a very larg review , it would tell me that transcation lock time out ,and the review can't submit.

i tried to change the transcation level , i excute "set global transaction isolation level SERIALIZABLE;"

but i found something in general log

5905 Query SET SESSION TRANSACTION ISOLATION LEVEL SERIALIZABLE
]]]]]100723 17:12:20 5905 Query SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED

the application would set the transcation level by itself ...

who can tell me how to avoid this error

however , some guys told me this bug had fixed

http://jira.atlassian.com/browse/CRUC-3143