Found locale but those settings are ok. 

The strange part is that on my laptop the problem does not occur (tested yesterday evening)

After checking if there were any differences between my laptop and my PC I found the problem:
on my PC the list separator was set to "," instead of ";"

All is running fine now.

Switching off :-))

What do you mean with "locale"?

Which locale, precisely, are you using?

I've switched to Dutch. The settings I now get are:
0,39;318,0; 0,44;450,0; 0,45;450,0; 0,45;339,0

SkyDemon has switched to using a comma as a decimal separator and a semicolon as the separator between numbers.

Did a simple check: if I set countrysettings to US (i.e. decimal separator "."(dot) ) than the problem does not appear.

So it definitely has to do with the comma as decimal separator

Maybe you (Tim) can try to reproduce this problem by setting your Windows country settings to Dutch

I don't suppose you're doing anything wrong, but we have full support for different decimal separators in SkyDemon so I've no idea why you're seeing that. We have thousands of European subscribers for whom this isn't a problem which is very puzzling.

Can anyone else (in Europe with a comma decimal separator) reproduce this?

I notice that if country settings are set to "," as a decimal separator weight and balance coordinates of the envelope are messed up as the coordinates separator is also a "," I live in Holland and we use a "," (comma) as a decimal separator

This is entered initially:
205,669,205,720,410,980,564,980,564,669,205,669

This is how it looks like when I edit the W&B coordinates:
205,00,669,0, 205,00,720,0, 410,00,980,0, 564,00,980,0, 564,00,669,0, 205,00,669,0

This is how it looks like if I edit the data again:
205,00,0,0, 669,00,0,0, 205,00,0,0, 720,00,0,0, 410,00,0,0, 980,00,0,0, 564,00,0,0, 980,00,0,0, 564,00,0,0, 669,00,0,0, 205,00,0,0, 669,00,0,0

Looks like every item is converted to a decimal format (with 1 or 2 decimal places)

Am I doing something wrong or is this a bug ?

Skydemon Version 3.3.1.0