Hello been using this product for years and first time ever with issue. Suddenly I'm not able to save in Adobe Reader DC, such as just saving to my computer from receiving a PDF document by email for example. The "Save file" icon in the upper left has become disabled, as is the "Save" option in the File drop down menu. Also all of my existing PDF's have sort of disappeared (they are still there but no longer as PDF). I've tried a few things such as "repair" and "uninstall/install" Adobe Reader DC from control panel, and restarting computer but these did not work. I'm on Acer desktop with Windows 10. Any help? Thank you.
Resolved! My computer settings had changed somehow so that it was instructing to open Adobe documents with Firefox. Changed it back to "open with Adobe" on Properties / General by right clicking on a document icon. Very big thank you to Adobe rep who helped me by phone call.