I'm also having this issue.

Dito

Same

Have the same bug

OK found how to fix it.
in the file Steam\steamapps\workshop\content\236850\1385440355\interface\countryestatesview.gui
replace the lines 157-165

windowType = {
name = "estate_gridbox_proxy"
position = { x = 0 y = 0 }
show_position = { x = 0 y = 0 }
size = { x = 100 y = 100 }
moveable = 0

gridBoxType = {
name = "estate_items_gridbox"
position = { x = 0 y = 0 }
size = { width = 500 height = 150 }
slotsize = { width = 250 height = 150 }
max_slots_horizontal = 2
format = "UPPER_LEFT"
}




With the following.

listboxType = {
name = "privileges_list"
backGround = ""
position = { x = 5 y = 87 }
size = { x = 240 y = 150 }
Orientation = "UPPER_LEFT"
horizontal = 1
spacing = 0
scrollbartype = "standardlistbox_invisible"
borderSize = { x = 0 y = 0 }
}

scrollbarType = {
name = "privileges_scrollbar"
slider = "landslider_SliderButton"
track= "landslider_TrackButton"
leftbutton = "landslider_upButton"
rightbutton = "landslider_downButton"
size = {x =230 y =12 }
position = {x= 10 y =145}
priority = 100
borderSize = {x =16 y = 16}
maxValue = 1
minValue = 0
stepSize = 1
startValue = 0
horizontal = 1

guiButtonType = {
name = "landslider_SliderButton"
quadTextureSprite = "GFX_scroll_drager_blue"
tooltip = ""
tooltipText =""
delayedTooltipText = ""
position = { x=0 y =0}
}
guiButtonType = {
name = "landslider_TrackButton"
quadTextureSprite = "yearslider_background"
position = { x=12 y =12}
tooltip = ""
tooltipText =""
delayedTooltipText = ""
}
guiButtonType = {
# parent = "landslider_SliderButton"
name = "landslider_upButton"
quadTextureSprite = "GFX_scroll_left_gold"
position = { x=0 y =0}
}
guiButtonType = {
# parent = "landslider_SliderButton"
name = "landslider_downButton"
quadTextureSprite = "GFX_scroll_right_gold"
position = { x=0 y =0}
}
}

This worked for me, but I have only played about 1 hour and only on 1 nation. but the fix is save game compatible as far as I can tell.
However I am not a 'professional modder' so I have no idea if this will cause some other truble.

same bug :c

i rolled back to 1.30.4 - it was pretty easy to do and to play the mod, i dont need the latest patch, so thats my bugfix for now. thanks for the work anyway :)

having the same issue