I have found a workaround, though not the reason.
The version of my program with the corrupted Umlaute is from 2013. I have send 
my customer a test version of a newer version of my program from 2014 and 
voila, all Umlaute appear correct.
This show to me that the issue is a Livecode issue in combination with Sierra. 
Since I don't have a history, which standalone I have build with which LC 
version (I should start with such a history now), I can't say which LC 6 
version works with Sierra and which LC 6 version not. I think some nerds can 
find the LC version in the hex file of the stack, but I can't.
Does anybody remembers if there was some change in handling code tables?
Any other idea as giving the customer a free upgrade?
Tiemo


-----Ursprüngliche Nachricht-----
Von: use-livecode [mailto:use-livecode-boun...@lists.runrev.com] Im Auftrag von 
Tiemo Hollmann TB
Gesendet: Mittwoch, 16. November 2016 17:20
An: 'How to use LiveCode' <use-livecode@lists.runrev.com>
Betreff: AW: German Umlaute get corrupted on macOS Sierra

Hello Hermann and Paul,
good idea, but my customer checked "Tahoma" with the fontbook and it is 
installed and looks fine in the fontbook.
I also tried the indirect enter with holding the "u" for 2 sec and then 
choosing the "ü" from the menu, but the letter also is corrupted, when 
displayed in the field. Very weird.
Thanks
Tiemo

-----Ursprüngliche Nachricht-----
Von: use-livecode [mailto:use-livecode-boun...@lists.runrev.com] Im Auftrag von 
Paul Hibbert
Gesendet: Montag, 14. November 2016 22:07
An: How to use LiveCode <use-livecode@lists.runrev.com>
Betreff: Re: German Umlaute get corrupted on macOS Sierra

I run Sierra on an older iMac (2009) and a newer MacBook Pro, I don’t see any 
problem with LC6, I just tested the German Umlaut with pasted text as well as 
typed text in LC5.5.5, LC6.7.11(rc2) and LC8.1.2(rc1) and I’m seeing exactly 
the same result in all 3 versions, the umlauts are present and correct.

If it’s just one customer on one Mac, I would guess that maybe it’s a Font 
problem, can you check if they have the same font installed that your app uses, 
and if it is, maybe they need to check for font problems with the Font Book.app 
(should be in their Applications Folder).

Paul

> On Nov 14, 2016, at 8:52 AM, Tiemo Hollmann TB <toolb...@kestner.de> wrote:
> 
> Hello,
> 
> 
> 
> Today a customer with a Mac book Air and macOS Sierra called me and 
> told me that all German Umlaute in my LC 6 program are corrupted 
> (while they are working fine in all other programs). This is in text 
> displayed in fields as well as text entered in fields.
> 
> Since I don't have Sierra yet installed on my machine, I can't 
> reproduce, if this is a general Sierra issue, or something special on 
> that customer machine. Since this is the first customer telling me 
> this problem I don't even know, if no other customer has installed 
> Sierra yet and it's a LC 6 - Sierra issue or if others already have 
> installed Sierra and don't see this issue.
> 
> 
> 
> I checked with this customer all language and keyboard layout settings 
> and they are all standard German, like on my 10.11 machine.
> 
> Has anybody any idea what could cause such a phenomenon? Any idea what 
> to look for? Or is LC 6 just incompatible with Sierra?
> 
> Thanks
> 
> Tiemo
> 
> 
> 
> 
> 
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