I have a VSTi (Ohmforce Symptohm) for which the presets do not appear. However, I know where the preset files are located on hard drive. They must not be in the correct location. What folders should those go in? Alternatively, is there a way to point over to the location where they are right now? I also have the same problem with an effects plugin (Ohmforce Ohmicide).
Ohmforce plugins have their own preset system, don’t they? They should be available from within the plugin’s preset browser. If not, maybe try reinstalling the plugins?
Or did you try loading a preset using Cubase’s own preset mechanism, on the plugin toolbar? That won’t work, because Cubase has no way of knowing about proprietary preset files.