Do you have the latest update to PrintCentral? If you keep an eye on developments in the App Store you'll know that PrintCentral has been missing for a few weeks, only to 're-appear' yesterday. Sounds good??!!!
But the update has removed the 'in app' printing capability that the original version had for 'compatibility reasons'. Several people complained and developer responded that the change had been 'forced on them by Apple'.
So several people - me included - are not updating our copies of PrintCentral in order to retain that in-app printing capability. If you already updated, there's no way back, I'm afraid and you now have to switch out of, say, Pages and print your document from within PrintCentral.
I'm not entirely sure why Apple have insisted on this change; it was, after all, one of the most appealing features of PrintCentral - that it 'appeared' like an AirPrint printer. Now that's gone, I'm not exactly sure what I would do if I needed to install an app to enable printing to non-AirPrint printers.
Tim
Scotland