FL 20 and is therefore backwards incompatible (see image). I can assure you that this project was created in FL 12 and sometime before I'd even considered downloading FL 20 (see image).
I've also noticed that FL 20 is just ...
FLStudio with my current Project was opened. I have restarted the Computer and tried to load the project file again. Now, it hangs while searching for the sylenth1.dll. If i create a new project, sylenth1 loads correctly and works ...