I think this might be a pretty universal issue, but it might also be an intended behavior, but, like I said, better safe than sorry. So, Llamas, you can tame them, summon them, summon custom them, saddle them with carpets, give them chests, lead them, and tie them down with leads. What you can not do, is ride them. I mean, you can get on their backs and all, but you can't really control where they go, at all. In fact, all they do when you mount them, is stand in one place. Plus, they have no Jump Bar. I mean, they seem to share similar abilities to Donkeys and Mules, and they, like Horses, have Jump Bars, so, why not Llamas? I get this is kinda two issues, but I'm trying to get my point across effectively, Plus, I think the lack of a Jump Bar might be linked in some way to the inability to actually ride them in a controlled manner. Hope this gets resolved. Rockatoa, Brickticks out!

StR:
1. Get Llama, (any method of obtainment will work).
2. Tame Llama, (if summoned, may be already tamed, if is, skip to step three).
3. Saddle Llama with a carpet, (Color doesn't matter).
4. Optional: Put chests on Llama, (It doesn't really matter if the have chests or not, hence "Optional").
5. Mount Llama.
6. Apply forward motion with your chosen forward movement key.
7. Observe the lack of forward movement, (or any movement for that matter), from your new Llama.
8. Move your Llama to a secure area via lead to avoid it getting into trouble while the glitch is worked on.
9. Don't take you Llama if you want to tame a wolf.
10. Wait for the glitch to be fixed.
11. Observe the glitch being fixed.
12. Ride off into the sunset on your now fully functional Llama.
13. Thank the Mojang Employees for your new Llama friend.