Please get in touch with us at any of the other support channels – https://helpx.adobe.com/support.html . Since this is not a generic issue that we can reproduce at our end, we will need someone to look into your machine to figure out what is going on here.
Ashutosh Chaturvedi | Sr. Quality Engineering Manager – Illustrator
An error occurred while saving the commentA.Marques commented
Oh yes, been having this problem today, except I've also tried copying from another document to no avail, and so far this is the only page I have found on this particular issue, quite annoying.
Having a quick fix would be awesome since the project I'm working on this very moment requires me to fetch a bunch of assets from another documents, and having this glitch is seriously hampering my progress.
Also, possibly unrelated, before I opened up illustrator this morning to work I was greeted by a .NET framework warning about a clipboard issue, of which I got to go away by downloading a fix from MS, but so far illustrator been acting the same.
If anyone know something please speak up.