Halion One only loads VX presets

I’ve seen a lot of people having trouble with Halion One, but I haven’t been able to find a solution to my problem. Halion One recognizes all of my presets from the MediaBay, but if I try to open any presets other than the “VX” plug-ins (e.g. “Solo Trumpet VX”) I get the error message:

HALionOne: Cannot Find or Load Preset “X”

Any help or advice you could give me would be greatly appreciated! I’m running the trial version of Cubase 6 (Studio 5 is already installed on my computer, but is suffering from the same issue) on Windows 7 64-bit. I haven’t installed any plug-ins other than those included by Steinberg.