They are truly hidden 'show'(-1).

Thanks for the explanation and the ideas.  I ended up creating the following function:

def fn_mask_commas$(local x$)
x$=stp(x$,3,","); local s=msk(x$,"##*0*"),e=s+msl-3,p
if s<e then for p=e to s step -3; x$=x$(1,p-1)+","+x$(p); next p
return x$
end def

I'm not sure the sub() function is working correctly with a negative occurrence argument.  Tried it in versions 12.50 and 15.10.

-}?sub("#####.000","###",",###",-1)
,#####.000

Shouldn't it return this?
##,###.000

Out of curiosity I tried this which works:
-}?sub("#####.000","#","0",-1)
####0.000

But this didn't:
-}?sub("#####.000","##","0",-1)
##0#.000

I would have expected ###0.000.

Is there an explanation or is this a bug?

In this case it is not PxPlus 2016.  We actually have another background process on the same server executing the same code that the webserver process is executing and the *web/email call works perfectly in that process.  So it's something different about the webserver process that I cannot figure out.  I'm passing all the same values in the *web/mail call for the equivalent arguments of the *web/email call.  I'm not passing any timeout value to *web/email and it's taking the full 60 seconds to fail based on the time stamps of the logging that we're doing.

This really is perplexing because it's a very simple text/html email with the server address, port 25 specified, from address, reply address same as from, one to address, a subject, and a very short message.  No authentication, ssl, cc addresses, bcc addresses, or attachments.

I solved the problem by creating a command program to "print" the program in memory to a specified file channel.

For example, copy and paste the program below into command mode and save it as *cmd/l2c (list to channel).  Now you can open a file or device to a channel and enter l2c followed by the channel # and it will list the program in memory to that file without splitting the lines.

0010 ! *cmd/l2c - list to channel
0020 enter c$,err=USAGE
0030 c=num(c$,err=USAGE),m=65000,l=tcb(12)-1
0040 x$=lst(pgm(++x,l)),x=num(x$(1,pos(" ?":x$)-1)); if x<m then print (c,err=USAGE)x$; goto *same
0050 exit
0060 USAGE:
0070 print "Usage: l2c channel",'LF',"channel: the channel # to output to"
0080 exit

A tree view list box has a large number of elements.  The list_box read is returning a negative index that results in an error 41 when used with list_box find to look at elements above and below the current index.  The item property doesn't error with the negative value, but accessing the itemtext$ property afterwards reslults in an error 11.

I coudn't find any index limits in the language reference, but it seems to be limited to something in the 32k range.  Has anyone run into this and found a workaround?  Is it a PxPlus or windows limit?

So we have PxPlus 12.50 installed on the server with matching windx on the clients.  After some time goes by, the server reports version 12.51, but since windx still reports 12.50, nomads won't run.  We haven't installed 12.51.  Any idea how this version mismatch is happening?