Remote user avatar, dlattach vs 2.1's png, for same user on test site

[thegymforum]

So, I have plenty of members that have their own avatar images.  For example:

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<img class="avatar" src="http://smf.com/index.php?action=dlattach;attach=154;type=avatar" alt="">

Post upgrade, the same user/post that I'm looking at with 2.09 line above now turned to

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<img class="avatar" src="http://smf21.com/custom_avatar/avatar_71_1407880038.png" alt="avatar_Username123">

I don't really grasp the dlattach action and the attach index yet... Apologize if that's basic knowledge.

Under Admin avatar settings, I see the option to set the upload folder.  It's set to
http://smf21.com/custom_avatar .  Is there a setting that is off? didn't get ported over? is this a "bug" or, I'm sure all of my members can upload their avatars again...  Just thought perhaps it was something that someone could either let me know what's wrong or whether it's a reported issue already.   

Now that I'll be working on this a lot (testing etc), is there a bug database that I should search before posting here each time?  I'd hate to waste valuable developer time answering me if I could be solving my own issue.

yes, I did search for a solution before posting.

thanks for your time in advance

[Illori]

starting with 2.1, it is forced to use a custom folder for avatars as it improves performance.

it is working as expected.

[thegymforum]

ty for your prompt reply