New document dialog doesn't provide default values
When in Illustrator, I typically use ctrl-n, then hit enter to automatically open a new document.
However, the new document dialog as of Illustrator 2017.1.0 doesn't have default values filled when the dialog opens, and one is forced to pick the type of document one wants to create, from web, mobile, print, etc. instead of just hitting the "enter" key and changing these settings later.
In other words, you are complicating the flow of creating new documents.
Please accept my sincere apology for the inconvenience. New document dialog in new version shows the last used profile as default selection.
If you are still facing issue, Please get in touch with us at any of the other support channels – 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