Database session hangs

Guys I am using PL/SQL developer for my sql testing/debugging .I am debugging a pl/sql procedure (inside a package) and after coming out when I try to debug it again my session hangs.I contacted my dba and did the trick for me by killing the existing sessions,but didnt give me how the session was not killed in the first place after I come out of one debugging session.He is giving me a vague answer.Please let me know if u guys have any clue about it.
thanks
Manohar

It's not the problem on the Oracle side. Oracle or the DBA is not at fault.
I personally never had that problem.
How are you debugginhg?
Do you finish your debug session completely?
After finishing your debugging, Can you do a disconnect from the Developer successfully?

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