The new toolbar for taking action on comments in the Android app is kinda neat. I noticed a bug in it today though. This is in Android version 1.0.49, on a HTC One running Android 4.4.3.
You can click these screenshots for a larger view.
The bug is pretty simple. I can tap a comment (such as this one):
If I then follow a link (such as the one in that comment), the toolbar will remain active for that comment.
If I try to tap upvote, the app will give me a nonsensical error.
If I try to leave a comment reply, it will use the names of the authors of the comment and the question correctly, but the comment will disappear into the void... and turn up somewhere completely different. As illustrated here:
As you can see, it appears to get submitted perfectly fine, and the app doesn't complain at all. But that comment didn't show up on either the first question or the second, and I have accounts on both sites. I haven't deleted the comment. You may notice, however, the RPG.SE question I was replying to had a post ID of #48239... so it turned up on Physics.SE's post #48239. (Thanks to Andrew T. for finding this!)
Since I've upvoted that comment successfully now, though (through normal means), I can't flag it to see what'll happen there. (I've made a feature request on that here.)