Debugging not possible in single session mode

[John Duffy]

Hi,
PL/SQL Developer 9.0.6
I'm getting the above message and desperately need to do some debugging! It works fine on another database - so is it the database or the PL/SQL environment I need to change? I've tried the ALTER SESSION solutions I've found on the net and they don't work.
Can anyone point me in the right direction?
Thanks
John

 

[John Duffy]

Hi - don't worry I've found the setting