i am sorry i don't think illustrator ever closed after making a .pdf?
I agree that i too often made changes and was working on the .pdf. if you however check the keep editable with illustrator option you should be able to open that .pdf back in illustrator ,and keep your layers/editable text.
Seems that the issue here is that the text changes to outline? what font are you using? are you keeping the file editable in illustrator option checked?
If you want to report a bug, issue or as for something you can do it here:
https://www.adobe.com/products/wishform.html
This forum is made of volunteers, using that link will allow you to submit your request to the developers.
cheers
jonathan
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