I designed a editable PDF in Adobe LiveCycle Designer. Customers complain that PDF does not open and displays the following message:
Please wait... If this message is not eventually replaced by the proper contents of the document, your PDF viewer may not be able to display this type of document. You can upgrade to the latest version of Adobe Reader for Windows, Mac, or Linux by visiting http://www.adobe.com/go/reader_download. For more assistance with Adobe Reader visit http://www.adobe.com/go/acrreader.
I personally walked down to check and they are using the most recent updates too.
Figured it out. Customer was trying to open editable PDF in browser.
Asked customer to download and then open. Works fine.