Rounded Intonation Screw
It's extremely easy to round off the Allen hole on an intonation screw, they can usually only take a few adjustments before they'll start to give. When one finally goes round the first thing you should try is the long side of the Allen wrench. [usually you'll be using the short side and it can become rounded too speeding the demise of the screw] If you can't get any bite with the long side the easiest way to get it out is just drill the head off. I'll use a 7/64" bit here, just bigger than the shaft size.
These screws are fairly soft and will cut quickly if you're using a sharp bit.
When it's through the head will just stick on the bit as it breaks away. I could have taped off the pickup [or pulled the bridge] to do this but the shavings gather up easily with the magnetic head on my screwdriver.
I always just pull the saddle out so it's easy to put a set of needle nose pliers on the screw to back it out. It's totally loose but my fingers are way too big to get a grip on it.
Of course you'll need a new screw [and a couple spare to keep around]. You can order these from any Ibanez dealer or visit my Parts page. Slip the saddle back in to the position you wanted to move it to begin with and you're good to go.