Just for curiosity, is the problem related with the color of the sequence flow? I mean, the 'line part' of the flow doesn't appear at all? Or does it have the same color as the process background?
hmmm... interesting. Maybe the color is transparent. Have you tried to click on the flow and change its color?
None of the things I'm telling you will solve the issue but at least they can give us some hints to see what is happening.
I try to :
a- change the background color of the sequence flow => only the triangle's color is changed, the line part is transparent
b- change the border color of the sequence flow => the border of the triangle is displayed with the selected color and the line part the SequenceFlow as well (=> but i think it is only the border of the line part, the line part is so thin that it looks like it is the whole line part that is displayed with the selected color)
When having a look at the properties of a new SequenceFlow drawn it seems that the fields BackgroundColor, BorderColor, Font color are empty... When you click in a field, there is only cursor blinking
Another question by the way after these tests : once you have change border color of a SequenceFlow, it is not possible to erase it then even if you empty the field it keeps the previous color set.
Actually it is also the same kind of behavior with the dash line part of a Text Annotation although color properties are set to black color (#000000)
Sorry for the late response on this - just haven't been able to look at the forum in the last couple of days.
The color themes json that Designer uses has changed slightly from your previous used version. This is because we have added ability to define border colors on sequence flows now too.
To fix this issue you can go into Guvnor GlobalArea -> Assets and locate your "themes" asset. Open it and select File->Archive. Then in Guvnor go to Administartion->Archive and permanently delete the themes asset.
After that re-open an existing or create a new bpmn2 process..this will force Designer to upload the updated themes json into Guvnor.
Hope this helps.
Thanks Tihomir for the fix.
PS : No matter about your bit late reponse