Please accept my sincere apology for the inconvenience. 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.
An error occurred while saving the commentJames Lynch commented
I am having very similar issues. I go to open an illustrator file from finder. It launched photoshop instead. Then I try to open an illustrator file while illustrator is open, and I get that welcome page too. From that page, if I go to menu > open > then I find the document I want to open, Illustrator tells me it's already open.
Your comment on "being able to open files properly is a pretty basic feature..." couldn't be more spot on.
Do you, or anyone here, know about a fix?