My stand alone always open as a blank black window
George Ware
If you have'nt done this allready, then i suggest you:
1. Check if the newest version is installed, and if not then install the new Matrix.
2. Else reinstall the newest Matrix.
3. Perhaps you need a clean reinstall if a reinstall is'nt enough - that means deleting everything including hidden files - and then reinstall the newest Matrix.
Just remember to create a back-up first. Especially of your own work.
Still a problem after doing this, then contact Arturia Support.
Good luck.