I have just upgraded my computer to Windows 7 and upgraded GPO to the latest version. I use Sonar 8.5 as the sequencer.
I've written a simple piece in C, only major triads with a few major 7ths. I played the initial melody in a Cakewalk synth, Dimension Pro, and harmony in another Cakewalk synth, Rapture. Everything sounded great.
Then I attempted to add strings with GPO. The strings are significantly flat, as compared to the other synths. I checked, and all synths are set to standard tuning. Adding the strings using the Garritan Pocket Orchestra included in Sonar, the parts are in tune.
What could be wrong?