Yes, I was now able to add annotations without any problems. I found it interesting that as I started to enter the title for a new annotation all of the previous titles showed up so that I could select one of them. Indicates to me that even though they had been deleted the model still knew about them.
Now I would like to discuss the location and size of the annotation. I am just using the free version for now but if I step up to the Pro or Business version do I have better control of the annotation? In particular, sometimes the annotation hides part of the model that I am trying to explain/comment on. Also, it would be neat if I could have more control over the appearance of the annotation (i.e. more than 256 characters, the ability to have lists, the ability to control the color or highlighting of text).
Since my model was created in SketchUp and I use the SketchUp Uploader plugin, I cannot currently re-upload a model so correcting some things means I have to upload a whole new model.