This may be an issue with Shopp, not WordPress HTTPS. But without this plugin, this page:
links to this page:
When HTTPS is enabled, the link becomes this page:
Unfortunately, these pages are automatically generated by Shopp, so I cannot edit them to enable the "Force SSL" option on a per-page basis. In the HTTPS prefs, I have "Force SSL Administration" enabled, and "Force SSL Excusively" and "HTTPS Front Page" disabled.
Any thoughts why the HTTPS plugin causes just the opposite of what I'd expect to happen? Have I misconfigured it?