The best practise is to set a strong password to admin@logicbase.com and just leave it alone. Creating another admin account or permissions works just as fine.
Changing admin@logicbase.com password with another admin user after its broken won't work. It's password is saved not only in the database and once it's incorrectly changed your ServiceDesk is most likely already dead. The only way you should ever be changing admin@logicbase.com password is using the tool included in ServiceDesk 7.1 or downloaded from the KB in case of ServiceDesk 7.0 MR2:
How to change admin@logicbase.com password after installation?
http://www.symantec.com/docs/TECH146586
ServiceDesk 7.1 (or actually, Workflow 7.1) had a change implemented that no longer allows you to change the admin@logicbase.com password from Process Manager portal. Thus, this situation should not occur if you're using ServiceDesk 7.1.
For 7.0, there is a KB article you can use as a last resort (not very nice or safe):
How to recover ServiceDesk when Admin User password is unknown?
http://www.symantec.com/docs/TECH148718