The major issues include:

• When trying to open a PDF file in a Web browser, a blank screen appears, or the browser looks like it's still loading, but it is locked up or not responding. (most common)
• When trying to open a PDF file, a small red "X" appears in the top left corner instead of the document.
• The document does not load and the message "File is damaged and cannot be repaired" appears.

Solutions found to resolve these issues include:

• Solution 1: (perform this solution first)
  End the Adobe Acrobat Process from the Task Manager:
  1. Press Ctrl + Alt + Delete
  2. Click "Task Manager"
  3. Under the "Processes" tab locate and select the "AcroRd32.exe" or "Acrobat.exe"
  4. Click the "End Process" button on the bottom right corner.
  5. Click "Yes" when asked to confirm
  6. Repeat steps 3-5 until all "AcroRd32.exe" or "Acrobat.exe" processes are removed
  7. Continue to Solution 2 to help prevent this issue in the future
  
  
• Solution 2: Disable Web Browser Integration.  (Recommended)
  1. In Acrobat or Adobe Reader, choose Edit > Preferences > Internet.
  2. Deselect Display PDF in Browser, and then click OK.
  
  
• Solution 3: Save the PDF file to your hard drive, and open it in Acrobat or Adobe Reader.
  1. Right-click the link to the PDF file on the Web site, and then choose Save Target As (Internet Explorer) or Save Link As (Netscape Navigator).
  2. In the Save As dialog box, select a location on the hard disk, and then click Save.
  3. Double-click the PDF file to open it in Acrobat or Adobe Reader.
  
  
• Solution 4: Download the latest version of Adobe Reader.
  To update your Adobe Reader:
  1. Start Adobe Acrobat
  2. Choose Help > Update.
  or...
  You can download the update from the Adobe Web site at www.adobe.com/support/downloads/main.html