Cell Selector works in MicroStation SS10, but not PowerDraft SS10

We're experiencing a weird issue where the Cell Selector will work fine in MicroStation SS10 (08.11.09.908), but not in PowerDraft SS10 (08.11.09.912). PC's are identical with Windows 10

A Customised Workspace is being used, in which PowerDraft & MicroStation look at the exact same files on our Network including the exact same .csf  on our network (I have also tested without the workspace being used and its the same problem although it displays a different Keyin).

Both PC's show the exact same as the image above when double clicking on the Cell Grid.

In MicroStation, when clicking once, the selected Cell shows on the design for placement (which is normal behaviour).

In PowerDraft, the readout (bottom left corner of the Window) says "Unknown key-in or command".

Is there a limitation with PowerDraft or could there be something else going on?

I did not create the UCM file, but it has been working for a long time. Its only in PowerDraft that we're experiencing the issue.

Thanks,

The contents of the UCM are here.

init:
   key 'noecho'
   set OUTFLG = OUTFLG ! 8
   set a0 = ACTANG                     ;save active angle
;
prompt:					; this is set in string of menus
   msg 'prKey in symbol name e.g. 004001'
   get k,setcell,p,prompt,r,out
   cls key
   go prompt
;
setcell:
   set c0 = 'ac=' + key
   key c0
   tst relerr,eq,0,placecl
error:
   msg 'erInvalid cell name'
   key 'beep'
   go prompt
;
PLACECL:
   cmd pacler                    ;place cell command
   go exituc
;
exituc:
;   cmd nulcmd
   sli
   go out
;
out:
   set ACTANG = a0                     ;restore active angle
   set OUTFLG = OUTFLG & -9
   msg 'pr'
   key 'echo'
   key 'lv=$'
   end