Yea my Glory ponies are standing just fine at the moment, but they fall over really easy if something touches them.
Also Baby Apple Delight I have found many of these in the wild and all of them have thin vinyl at the base of the inside of the ear causing a gray like line that eventually breaks. ARGH
Ah, so that's what causes that gray line! I've noticed that on ponies in Ember's pose and wondered exactly what it was. Mystery solved!
Keep a watch on these because some of mine are splitting. I have not found a way to reinforce this issue either because of where the problem is. Some of my thinner ponies are stuffed with fiber fill which gives them a better chance of standing properly and not splitting. This, however, is just so hard to fix. Maybe a glue on the inside...hmmm I don't know.