[ivan]

I'm not familiar with the ZR's but looks like the string hasn't been properly installed.
If no other advices about this, try to replace it and, if the problem persist, wait for new comments. There's a lot of people here who can give you better advices than me.
Note: I'm just a player, not a technician but I have had similar (not same) problem in the past

 

[ivan]

Have you tried this:

http://www.ibanezrules.com/tech/setup/action.htm

 

[ivan]

me again,.....
You said the action (and I understand you raised the action on the bridge ) was not the problem ok?
what about the neck, is it bowed?, have you also tried to adjust the truss rod?