[aranthorn]

Yep, it's definitely the image sizer, but the code is different in the new version.

I just turned it off for the avatars:
find:

	$member_avatar = $member_avatar['avatar'];

		if(preg_match ( "/\.php/", $member_avatar) || preg_match ( "/avatar/", $member_avatar))
		{
			if (preg_match ( "/\.php/", $member_avatar))
			{
				$member_avatar = $forumpath."/".$member_avatar;
			}

			$sizedata="";
			if ($imagesizer==1)
			{
				$check = getimagesize($member_avatar);
				$avatarwidth  = $check[0];
				$avatarheight = $check[1];
				if ($avatarwidth > $maxavatarwidth) { $avatarwidth = $maxavatarwidth; }
				if ($avatarheight > $maxavatarheight) { $avatarheight = $maxavatarheight; }
				$sizedata = "width='".$avatarwidth."' height='".$avatarheight."' ";
			}

			return "<img src='{$member_avatar}' border='0' alt='' ".$sizedata."/>";

and replace with:

	$member_avatar = $member_avatar['avatar'];

		if(preg_match ( "/\.php/", $member_avatar) || preg_match ( "/avatar/", $member_avatar))
		{
			if (preg_match ( "/\.php/", $member_avatar))
			{
				$member_avatar = $forumpath."/".$member_avatar;
			}
/*
			$sizedata="";
			if ($imagesizer==1)
			{
				$check = getimagesize($member_avatar);
				$avatarwidth  = $check[0];
				$avatarheight = $check[1];
				if ($avatarwidth > $maxavatarwidth) { $avatarwidth = $maxavatarwidth; }
				if ($avatarheight > $maxavatarheight) { $avatarheight = $maxavatarheight; }
				$sizedata = "width='".$avatarwidth."' height='".$avatarheight."' ";
			}

			return "<img src='{$member_avatar}' border='0' alt='' ".$sizedata."/>";
		}

	if (($avatarid==0) && ($filename!=""))
	{
		$sizedata="";
		if ($imagesizer==1)
		{
			$check = getimagesize($path);
			$avatarwidth  = $check[0];
			$avatarheight = $check[1];
			if ($avatarwidth > $maxavatarwidth) { $avatarwidth = $maxavatarwidth; }
			if ($avatarheight > $maxavatarheight) { $avatarheight = $maxavatarheight; }
			$sizedata = "width='".$avatarwidth."' height='".$avatarheight."' ";
		}
*/
		return "<img src='{$path}' border='0' alt=''/>";

This comments out the avatar resizing.

NO, I don't see this as a fix. Only the author can give a fix, IMHO.

Thanks to LightInClouds for pointing me in the right direction and ranj for the original fix which I just tweaked for this work around.