I've been informed that the Nook original expects its screensavers to be stored in sub-directories under
[Nook drive:]/my screensavers
rather than
[Nook drive:]/screensavers
This will need a little more work from me. By the time I've finished, my volunteer tester will probably have gone to bed, but I'll try to release a new plugin version, supporting both Nook STR and Nook original models, as soon as I can.
In the meantime Nook STR owners should be OK with the current version (1.5.0)
Apologies for any confusion.