Many common issues when using Garritan products can be fixed by updating the ARIA Player. To determine which version of the ARIA Player is installed, launch the player and click the Settings tab on the right. At the bottom-left, the versions of both the ARIA Player and the ARIA Engine are displayed. As of ARIA Player 1.111, the player and engine versions should be the same (unless you own Garritan Abbey Road Studios CFX Concert Grand in addition to a separate library, in which case the engine version will be higher than the player).
Version 1.872 is the most current version of the ARIA Player:
After updating your ARIA Player, here are some useful links for using the Garritan ARIA Player with other programs: