Whenever I load into a world, all inserters that were previously set to blacklist by the mod revert to whitelist - but only outside of the area that is directly loaded by the player's presence (the area where you can zoom in on the map and see the buildings, it might work with Radars too). It is a HUGE issue with the mod since I am using it with SetazeR's "Filter Inserters Begone!" mod. It's also highly problematic for me since all my blueprints have now moved on to not using filter inserters.

Edit : Actually, it just seems to be random but over a global scale of the game. I have no idea what's causing it.

Edit 2 a few minutes later : If I encounter any issues again I'll make another edit to this discussion starter, but for now consider it "solved" because I might have just inadvertantly disabled one of the two mods somehow at one point.