Same problem here. Clicking the Continue button only works when we first save the file. Then open that file and follow that 4-click path to send emails. What before took only 2 clicks...
We decided to install the previous version again and disable the update service. At least it fixes the problem. Hopefully the next update will fix all this.
That is what we are trying to do.
We are having this same problem at our business. The PDF opens in IE and when you click the "Share files" button in the top toolbar and then send as attachment, clicking continue does nothing. It won't open the Outlook client with the PDF as an attachemnt. The only way to currently make this work is to first save the PDF locally, then attach the file.
Adobe Acrobat and Reader official update (19.008.20074) containing the fix for this issue is now available. This update will be automatically pushed to all existing installations of Acrobat and Reader. If you want, you may also manually trigger the update early by opening the application and going to Help > Check for Updates.
More information about this release is here: https://helpx.adobe.com/acrobat/release-note/release-notes-acrobat-reader.html
Please try it out and let us know your feedback.
Thanks for your patience and support!