Again, can you run Garritan in the standalone Aria Player? Did you buy GPO from MakeMusic/Garritan or did it come bundled with another program?

The first thing I would do is to try to run GPO using the standalone Aria Player, which should have installed when you installed GPO. Licensing for Garritan products is via a graphics image file that looks sort of like a credit card. You just drag that image onto the Aria player, and that library (in this case GPO) should be unlocked. The license is on a user basis, so you can unlock GPO on multiple machines.

If you can play instruments in the stand-alone player, then I would try running BIAB as "administrator" (right click on the BIAB icon and select "run as administrator". If that works, you can make that permanent by right clicking on the icon, selecting properties from the drop down menu, and then select the Compatibility tab and check the box "Run as administrator".

You might also try removing the VSTi from your BIAB list and then adding it again and see if it works.

After that, I'm not sure what to do. I have all the Garritan libraries running well on two different computers (Win7 and Win8.1), so I know it works.

John

Laptop-HP Omen I7 Win11Pro 32GB 2x2TB, 1x4TB SSD
Desktop-ASUS-I7 Win10Pro 32GB 2x1.5TB, 2x2TB, 1x4TB SATA

BB2025/UMC404HD/Casios/Cakewalk/Reaper/Studio One/MixBus/Notion/Finale/Dorico/Noteworthy/NI/Halion/IK

http://www.sus4chord.com