A simple form to show problem:
[code]
load 'jzgrid'

TEST =: 0 : 0
pc TEST;
xywh 0 0 50 100;cc grid1 isigraph rightmove bottommove;
xywh 51 0 50 100;cc grid2 isigraph rightmove bottommove;
pas 6 6;pcenter;
rem form end;
)

TEST_close =: 3 : 0
wd 'pclose'
destroy__grid1 ''
destroy__grid2 ''
)

run =: 3 : 0
grid1 =: '' conew 'jzgrid'
grid2 =: '' conew 'jzgrid'
wd TEST
wd 'pshow'
CELLTYPE =: 100 0
CELLDATA =: (5 #  1) ; 5 $ 100
GRIDID   =: 'grid1'
show__grid1 'CELLDATA CELLTYPE GRIDID'
CELLDATA =: 5 2 $ 1 ; 100
GRIDID   =: 'grid2'
show__grid2 'CELLDATA CELLTYPE GRIDID'
)

run ''
[/code]

When I click on checkbox in left grid I see next error message:
---------------------------
wdhandler
---------------------------
error in: TEST_grid1_mbldown

index error: writeblock
   CELLDATA=:new     ndx}CELLDATA
---------------------------
ОК
---------------------------

I don't know is it bug or just limitation. But I didn't find any mention in docs that grid with CELLDATA as boxed columns has any limits.
--
Mikl
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