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PHP expects 6 arguments. You gave the first one and the last 2 are automatically filled in. You can give the function a default width, but you can also specify the parameters yourself. I recommend having a default width, that would be something like this:

// Outputs markup to display a user's avatar
function generate_avatar_markup($user_id = '', $avatar_type = '', $avatar_width = '100px', $avatar_height = '100px', $username = NULL, $drop_cache = FALSE)
{

I don't really understand the function though, it calls $img_size[3], but I don't really see it defined anywhere. But please try this first, perhaps there are other errors and we'll see.

Nice work!

Although I'm planning to create PunBB extensions, I'll try updating the current language pack.

Thank you very much I'll let you know how it goes