I have just installed and tried both Fishing Buddy and Fishermans Friend. I have my underlight angler installed.
With both addons, double right click just makes me run into the lake, not cast. I’ve checked mouse settings and key bindings and come up with nothing.
Any ideas? Thanks in advance… (I hope I put this post in the correct spot, going to post in General, as well… hope that’s ok!)
I also understand that with Fishermans Friend, you have to add the angler? I see nowhere to do that…
In the Fishing Buddy options, select the Fishing tab. Make sure that Easy Cast is selected, the Casting Button pulldown is set to Right Mouse Button, and the Easy Cast pulldown is set to None.
Although, if I change those settings the right mouse button doesn’t make me run forward, so it sounds to me like you have something else conflicting with the fishing addons. Not sure what it could be , though; all I can suggest is disabling all your other addons aside from FB & see what that does.
I guess I’ll have to do that 
those things are checked.
I had to go to the “Macros” tab of the Fishing Buddy options, create a macro, then put that on my bar and use it instead of the normal ability.
curseforge/wow/addons/fishermans-friend
the first few comments for FishermansFriend explain how to add the UnderlightAngler to the addon. Tested and works. Just need to edit a file with notepad.
poleID update for new Underlight Angler:
local poleIDs = {
[6256] = true, – Fishing Pole
[6365] = true, – Strong Fishing Pole (+5)
[6366] = true, – Darkwood Fishing Pole (+15)
[6367] = true, – Big Iron Fishing Pole (+20)
[12225] = true, – Blump Family Fishing Pole (+3)
[19022] = true, – Nat Pagle’s Extreme Angler FC-5000 (+20)
[19970] = true, – Arcanite Fishing Pole (+40)
[25978] = true, – Seths’ Graphite Fishing Pole (+20)
[43651] = true, – Crafty’s Pole (+1000)
[44050] = true, – Mastercraft Kalu’ak Fishing Pole (+30)
[45858] = true, – Nat’s Lucky Fishing Pole (+25)
[45991] = true, – Bone Fishing Pole (+30)
[45992] = true, – Jeweled Fishing Pole (+30)
[46337] = true, – Staat’s Fishing Pole (+3)
[52678] = true, – Jonathan’s Fishing Pole (+3)
[84660] = true, – Pandaren Fishing Pole (+10)
[84661] = true, – Dragon Fishing Pole (+30)
[116825] = true, – Savage Fishing Pole (+30)
[116826] = true, – Draenic Fishing Pole (+30)
[118381] = true, – Ephemeral Fishing Pole (+100)
[133755] = true, – Underlight Angler (+60)
}