Looks to me like something is going on with the truncated display, as the 
default display is 

    9!:36 ''
0 256 0 222

and 

    222%2
111
   222%3
74
   222%4
55.5

and the point at which the spacing is 'flattened' is 112 for 2 lines per table, 
75 for three lines per table and 56 for 4 lines per table

changing the display to 

    9!:37 [ 0 256 0 20   NB. truncate at 20 lines

   i. 4 4 2  NB. expected
 0  1
 2  3
 4  5
 6  7

 8  9
10 11
12 13
14 15

16 17
18 19
20 21
22 23

24 25
26 27
28 29
30 31
   i. 5 4 2  NB. truncated but spaced properly, possibly a boundary condition?
...

 8  9
10 11
12 13
14 15

16 17
18 19
20 21
22 23

24 25
26 27
28 29
30 31

32 33
34 35
36 37
38 39
   i. 6 4 2  NB. truncated and not space properly
...
 8  9
10 11
12 13
14 15
16 17
18 19
20 21
22 23
24 25
26 27
28 29
30 31
32 33
34 35
36 37
38 39
40 41
42 43
44 45
46 47

Cheers, bob

> On Apr 23, 2019, at 8:14 AM, Raul Miller <rauldmil...@gmail.com> wrote:
> 
> I haven't spotted anything about this (yet) in the release notes, either.
> 
> https://code.jsoftware.com/wiki/System/ReleaseNotes/J807
> https://code.jsoftware.com/wiki/System/ReleaseNotes/J901
> 
> (Unless maybe the j807 result assembly consolidation is an issue here, 
> somehow?)
> 
> A workaround is:
>   A=:i.112 2 2
>   _1 _1}.1 1 }.":@<A
> 
> Thanks,
> 
> -- 
> Raul
> 
> On Tue, Apr 23, 2019 at 11:08 AM David Mitchell <davidmitch...@att.net> wrote:
>> 
>> It started failing in J807.  It was ok in j806.
>> 
>> On 4/23/2019 11:02, David Mitchell wrote:
>>> The grouping stops after 111:
>>> 
>>>    i. 111 2 2
>>> ...
>>> 
>>> 148 149
>>> 150 151
>>> 
>>> 152 153
>>> 154 155
>>> 
>>> ...
>>> 
>>>    i. 112 2 2
>>> ...
>>>   4   5
>>>   6   7
>>>   8   9
>>>  10  11
>>> 
>>> ...
>>> 
>>> 
>>> On 4/23/2019 10:52, David Lambert wrote:
>>>> Did I not carefully read release notes?
>>>> 
>>>>    i. 3 2 2   NB. expected grouped APL display
>>>>  0  1
>>>>  2  3
>>>> 
>>>>  4  5
>>>>  6  7
>>>> 
>>>>  8  9
>>>> 10 11
>>>> 
>>>>    i.777 2 2  NB. where are the tables?   NB. extra truncation in emacs
>>>> ...
>>>> 3080 3081
>>>> 3082 3083
>>>> 3084 3085
>>>> 3086 3087
>>>> 3088 3089
>>>> 3090 3091
>>>> 3092 3093
>>>> 3094 3095
>>>> 3096 3097
>>>> 3098 3099
>>>> 3100 3101
>>>> 3102 3103
>>>> 3104 3105
>>>> 3106 3107
>>>> 
>>>>    JVERSION  NB. recent versions
>>>> Engine: j901/j64/windows
>>>> Beta-d: commercial/2019-04-21T12:38:39
>>>> Library: 9.01.03
>>>> Platform: Win 64
>>>> Installer: J901 install
>>>> InstallPath: c:/users/mat45899/downloads/j901_win64/j901
>>>> Contact: www.jsoftware.com
>>>> 
>>>> 
>>>>    Note 'this version shows expected grouping'
>>>> Engine: j806/j64/windows
>>>> Release: commercial/2017-11-06T10:03:54
>>>> Library: 8.06.09
>>>> Platform: Win 64
>>>> Installer: J806 install
>>>> InstallPath: c:/program files/j64-806
>>>> Contact: www.jsoftware.com
>>>> )
>>>> ----------------------------------------------------------------------
>>>> For information about J forums see http://www.jsoftware.com/forums.htm
>>>> 
>>> ----------------------------------------------------------------------
>>> For information about J forums see http://www.jsoftware.com/forums.htm
>> ----------------------------------------------------------------------
>> For information about J forums see http://www.jsoftware.com/forums.htm
> ----------------------------------------------------------------------
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