Strange issue since Isboxer 42 update

I have a weird issue with the new Isboxer 42 version.
I'm using the same old Pro config, 5 boxing, 2 screens, with a DxNothing on my 2nd screen to display the 4 inactive clients, pretty simple.
Everytime I switch between clients, I send a specific "swap" (swap1, swap2, etc) keymap in order to destroy and recreate the VFX viewers in my DxNothing, and at the same time, I run a couple of WoW macros (High settings and Low settings) to apply changes on my graphic settings on the fly, nothing fancy, I use this technique for ages now (thanks to Mirai :p), and it works fine.
Well, almost fine, cause since 42 version, I have a small issue.
If I switch by using a click method on any of my 4 VFX Viewers, or if I use a focus -previous or -next action, or if I Alt-Tab, it's ok.
But If I switch by using any Global Hotkeys (Ctrl+Alt+1, Ctrl+Alt+2, etc) assigned to each Slots, the good old /follow {FTL} macro stored in my Game Helps WoW Quick Setup 41 don't work anymore on the previous active slot.
In short:
Slot1 active (foreground) : I hit my follow key, slots 2, 3, 4 and 5 are following prefectly, no issue.
Then I switch to Slot2 by using the Ctrl+Alt+2 hotkey (global): I hit my follow key again, and slots 3, 4 and 5 are following my Slot2 character , fine , but ... the previous active char, Slot 1, don't find its target and don't follow (I have a red error message in WoW 'You don't have any target")
But as I said previously, if I switch by using any other method (click on a VFX viewer, previous/next window action, alt tab, etc), no issue.
Even more bizarre, if I remove the Swap settings part of the Swap macros, it works fine again with the Global Hotkeys.
The 2 swap setiings WoW macro are pretty standart
High Settings :
- Code:
-- Camera
/console cameraSmoothStyle 0
-- Distance
/console graphicsViewDistance 3
-- Environnement
/console graphicsEnvironmentDetail 3
/console weatherDensity 1
--Texture Filtering: 4x Anisotropic
/console graphicsTextureFiltering 4
-- Ground Clutter
/console graphicsGroundClutter 5
-- Render Scale
/console renderScale 1
Low Settings:
- Code:
-- Camera
/console cameraSmoothStyle 4
-- Distance
/console graphicsViewDistance 1
-- Environnement
/console graphicsEnvironmentDetail 1
/console weatherDensity 0
--Texture Filtering: 2x Anisotropic
/console graphicsTextureFiltering 3
-- Ground Clutter
/console graphicsGroundClutter 3
-- Render Scale
/console renderScale 0.5
I've tried many things (change the Key combinations of the WoW macros, change the different Slots restricted Global Hotkeys, etc) and I haven't found any fix yet.
I'm using exactly the same character set as before the Isboxer update (even tried to reload a backup)
The only thing I haven't tried yet is to rebuild eveything from scratch but well, so many macros, clickbars, menus, key maps ... :p
So, is there anything new in relation with the Global restricted hotkeys, or WoW macros, or Do Mapped Key actions, or anything else.
It's not game breaking, but it's really ... weird

Any help will be greatly appreciated.