Hi Gregory,
It is not very easy to diagnose this entity issue without actually testing a document that demonstrates the issue. You may need to file a case on this.
I will make some observations and maybe they will be helpful.
As you know, the correct syntax is – and not &nd;ash;. Because the parser does not recognize an entity named &nd; it is reporting an issue.
We must ask what is causing this to show up. Your description seems to suggest that – seems to get broken without your assistance. Do these show up in generated text? If they are generated by a stylesheet, perhaps there is a typing mistake somewhere in the stylesheet that generates the entity.
Are they used in external entity files that get pulled into the parent document? Perhaps there is a typing mistake there.
The randomness of this may suggest a typing mistake somewhere. I would pursue that thought to see what you can identify. If you can't track it down, you should simply file a case and attach an example that demonstrates the issue.
It is very unlikely that Editor would "break" an entity as it gets used. There must be a typing mistake somewhere.
Open a new case:
https://www.ptc.com/appserver/cs/case/case_logger.jsp
The warning about the jpeg notation is quite easy to fix. To stop this annoying message, open your document and select Entities-> Notations-> New-> Name=jpeg-> OK. All graphics referenced in Arbortext Editor must have a notation attached. Each notation must be declared either in the DTD or in the document itself. You are using graphics with notation=jpeg but have never defined the notation itself.
If you don't have access to an Entities menu then there is a customization in your application that turns it off. I've heard of that possibility. You could also file a case for that if necessary.
Regards,
Jerry Tippie