WowAce

Bug: Tested on both original r42 version and modified r42 version.

  * Sometimes all the mill buttons show up while there aren't any/enough millable herbs in my inventory.

Looks like it has something to do with zoneing
    * can be temporeraly solved by doing a /reloadui.
    * triggered by walking through portal(s) from:
        Shattrath City -> Stormwind
        Dark Portal <-> Hellfire Peninsula
        Hearthing from Eastern Kingdoms -> Oulands
        Boating Stormwind <-> Borean Tundra: Valiance Keep
        Hearthing Stormwind City -> Ashenvale: Astranaar
        Boating Darkshore: The Long Wash -> Stormwind City
        - Everything that makes you go to another continent?

    * If you do have millable herbs there will be two instances of the same button, overlapping the left most button.

For instance; I had some Nightmare Vine (7)
Addon only shows Nether Pigment button before zoneing
(/framestack returns:
    <2> profbars_inscbutton1
    <1> profbars_inscription

After zoneing all buttons show up with table: <number> <button name> and there's an additional button1 stacked on top of button9. The table numbers change everytime the bug occurs.

(/framestack tells me this:
    <2> profbars_inscbutton1
    <2> table: 374155C8 (profbars_inscbutton9)
    <1> profbars_inscription

Bug also occurs with just professionbars loaded.
Bug doesn't effect the Enchanting: Disenchant buttons.
Bug does effect Blacksmithing: Smelting buttons.
Probably effects Prospecting too but haven't tested..
Only tested  with buttons not being attached to tradeskill window.

No idea what's causing this, but I'm leaning towards it being a blizzard bug.