That's because the addon is written specifically to discenchant only greens, as stated in the description.

Seems quite a few blues are not being picked up by the addon for some reason, specifically [Prison Manifest] [Noise Machine] [Web Winder Gloves] [Wristguards of Verdant Recovery] [Dark Iceborne Leggings] [Incessant Torch]. It was able to get everything else in my bags. Otherwise I really love this addon it's what I've been looking for quite some time.

Well instead of using CTRL+ALT to blacklist an item for profession two, you could use SHIFT as the modifier for that...the only reason I recommended [mod:ctrl,mod:alt] was, since ctrl brought up the secondary profession, and alt is the "blacklist item" option, then it just made sense that {mod for secondary profession} plus {mod for blacklist item} = Blacklist Secondary Profession Item

My 2 Copper pieces: I think it should create all three, regardless of what professions the current character happens to have. After all, most people have multiple characters, and it's more convenient to have all of them available from the start to cover situations where a character unlearns one and learns another (Say someone dumped inscription and switched to Jewelcrafting instead...he would have to log off the character and back on to get the Prospecting one to pop up, wouldn't he?

Maybe, since no one can have more than two professions, it could create just ONE macro, which checks the professions you have, and the first one it finds gets loaded as a normal macro activation, and if it finds a second one that it covers, puts it in the macro as a [mod:ctrl], like so:

/run if IsAltKeyDown()then if IsCtrlKeyDown()then Deconstructive:BlacklistItem(<item2>)else Deconstructive:BlacklistItem(<item1>) end
/stopmacro [mod:alt]
#showtooltip [mod:ctrl]<Profession 2 Item>;<Profession 1 item>
/use [mod:ctrl]<Profession 2>;<Profession 1>
/use [mod:ctrl]<Profession 2 Item>;<Profession 1 Item>

Since it uses item codes, this should still squeek in under the 250 character limit? If not, maybe you could make an alias for "Deconstructive:BlacklistItem" in the addon like "DCon:BLItem"

(And yes, to blacklist an item for the [mod:ctrl] Profession, you would hold down alt AND control)

I have a mage with Tailoring/Enchanting and a rogue with Jewelcrafting/Mining. No macros were created for either character. Is there something that I need to do in order for the macro to be generated?

**Update**
I disabled the addon in game (via Optionless House), reloaded UI, enabled the addon again and then reloaded UI, and the macro is now there.
Works rather nice. As I said, a little more description of what this addon does, how to fix the problem like I had, and what to expect when using the addon would be good.

I've installed this addon, and I can access the /decon menu to get help or blacklist... But there is no macros or anything else. I've looked through the .toc and there is simply no information on how to use this addon.
And honestly, the description of what this accomplishes is rather vague. A more detailed description would be nice.

Doesn't seem to be disenchanting anymore, not automatically, anyway. It's requiring a specify an item, even though there is a green, non-enchanted, non-gemmed item in my bag.

seems fixed now

it happens every time i'm milling the last 5 herbs of a stack.

20 herbs, no problem
15, nada
10, nada
5 herbs = internal bag error

i think somehow you're trying to stack the last 5 herbs with another full 20 stacks, i'm saying this because the last 5 herbs in my bag didn't generate the error.