Hope someone can help with this…
(I've completed a few simple projects with EasyEDA/JLCPCB including surface mount assembly, so I have some experience but not much)
A component that I want to add to a project, a surface mount encoder, is causing problems when I create or update the PCB:
I gather this is usually an issue with pin numbering/names, but when I check the footprint things seem to line up:
So what am I missing and how can I fix this?
The symbol is rubbish. It does not match the actual device or the footprint assigned to it.
There is also a spurious drawn object in it just above and to the left of pin 9:
May I suggest that you use my modified version of both the symbol and the footprint:
Note that all the pads for soldering the device body to the PCB are numbered and named as GND.
This is OK. See:
https://easyeda.com/forum/topic/How-to-avoid-DRC-errors-when-connecting-to-PCB-Footprints-a-k-a-PCB-Libs-90bf944fe3644b21a7d27a9e9d8df8d6
And here it is showing the correct pad to pin mapping:
I have submitted an Error Report so it may get fixed in the library but in the meantime you'll find my part in the User Contributed library.
:)
Thanks fellas, problem solved, and I understand this much better than I did earlier today!
Brand new interactions and interfaces. 
Easy to use and quick to get started. 
Hi,
All you should need to do is assign the 6 missing pins in 'Component PIN information' (See your last image) 12-17 inc.
.
Just click the right hand box for each of those in red and change it to any number associated with GND, so 6,7,8,9,10 or 11 for eg. (I used 10)
.
You should find you can then update the PCB.
.
Regards
MrToM.