Thank you for the bug report! I'll have to take a look at the permissions for the avatars folder again. (I had this issue come up when I first converted the forum from MyBB to UBB.Threads.)
You're welcome. Forums almost always have hiccups when converting to new software. I don't know about a forum that doesn't have bug issues like that. People that I worked with on forum projects that were knowledgeable in coding always had those issues. It's all part of the process. Whether I was an Administrator or Moderator, I was thankful so thankful that I never messed with forum coding. I was good at everything else, but that.