Issues with changing Dungeon Themes

Hello, I'm sure you've gotten this one a lot, but it's causing me a fair bit of grief and I didn't see any other bug posts to help me out with this issue.

I recently (today, actually) unlocked the Empire and Arcane themes through My pet dungeon, however I can't select them. It says I've completed the requirements, but all I can access are Standard and Sovereign.

Now I did see forum posts stating that the Arcane theme was unavailable, however those posts were rather old (well over a year), and didn't say anything in relation to the Empire skin.

Any help you can provide on the matter would be most helpful.

(also; I would like to say that, despite only owning it for 2 day's now, I've racked up nearly 32 hours on it, and I have loved every minute of it. I have fond memories of playing Dungeon Keeper as a child and I love what ya'll have done in the spirit of the game. Please do keep up the great work and I look forward to seeing how you continue to improve this otherwise fantastic game.)