sorry,forgot to mention it's windows 10

The first thing I'd check is if ARIA somehow ended up in the blacklist.

Go to "Devices/Plug-in Manager" in CuBase and click the Blacklist tab.

If it shows up here, single click it and then click the Reactivate button in the bottom frame of the Plug-in Manager dialogue window.

I'm not sure, but it might require restarting CuBase if it was in the blacklist and you reactivated it.

See how that goes, and if it's not there I think the next step would be making sure the ARIA plugins are in one of the directories CuBase scans looking for plugins.

You can check all the paths that CuBase scans by clicking the little 'Plug-in Manager Settings" gear/cog icon at the bottom left of this same "Plug-in Manager" Dialogue window.  You'll need to make sure all the 64bit ARIA plugins are in one of these directories, or add a directory to these settings that contains them.

By default I believe the GPO5 installer puts a copy of the 64bit plugins ("ARIA Player VST_64.dll" and "ARIA Player Multi VST_64.dll") into

"C:\Program Files\Vstplugins"

unless you told it during the installation to put them elsewhere.  The 32bit stuff (Which CuBase 9 can't use) would typically end up in

"C:\Program Files (x86)"\Vstplugins".

You can also find extra copies of the dll plugins in ARIA's installation directory.  By default that usually goes into:

"C:\Program Files\Garritan\ARIA Player\VST". 

You could either use Window's File Manager Explorer to copy and paste the two "*_x64.dll" plugins into one of the listed directories in the CuBase Plug-in Manager, or just tell CuBase through its Plug-in Manager to also scan this directory (Cubase will blacklist the _x86 versions if you do it this way).

If you can confirm the plugins are in the right place, and that they are not in the blacklist but it's still not showing up in CuBase........try launching ARIA in stand alone mode.  Go to the 'info' tab of the ARIA Player, and apply all of the update checks to make sure you have the latest version of ARIA Engine.

If after all this, you still can't get ARIA instances in CuBase, I'm currently at a loss.  There are some CuBase settings files I have read about before that some users find they need to delete to correct misc. problems that can sometimes pop up.  If you think you might need this let me know and I'll try to hunt down valid links on the topic.

James,

Hopefully you will not need this, but if nothing above works out, I did come across this article that explains how to 'trash the preferences' in CuBase.  The walk-through is on an older version of CuBase, but it should all still be valid on CuBase 9.

http://www.pendlebury.biz/sbprefs/