This happens because the user account used by Internet Information Services (IIS) does not have access to the image using the path specified in Control.

The path to the image file needs to be the same on the server and computer that added the image to the line item. For instance, if you keep your artwork on a mapped network drive (e.g. Y:\ArtworkFiles\ProofImage.jpg) then that path must be valid on the server as well. Specifically, it must be valid for the user account used by IIS (typically the LocalSystem account).

To accomplish this:

On the server

1. Open Notepad (Start Menu > All Programs > Accessories > Notepad).
2. Add the following line, replacing the drive letter and path to the network share with the information for your mapped network drive.

subst Y: "\\server\share"

1. Save the file as add-drive.bat in the C:\Program Files(x86)\Cyrious folder (In the Save dialog box, make sure you change the file type from TXT to ALL).
2. Go to Start Menu > Control Panel > Administrative Tools > Task Scheduler.
3. Create a new task.
4. On the General tab, give the task a name (e.g. Add Drive).
5. Click the Change User or Group… button.
6. Type System in the box and click OK.
7. Check the Run with highest privileges box.
8. On the Triggers tab, click New…
9. Set Begin the Task: to At Startup. Click OK.
10. On the Actions tab, click New…
11. Make sure Action: is set to Start a Program.
12. Click the Browse button and select the add-drive.bat file you created.
13. Click OK and OK again on the Create Task window.
14. Restart the computer.

On the clients

1. Map a network drive using the same drive letter and path specified in the batch file you created in the steps above.

Now you should be able to add proof images from this mapped drive, and those images should appear in WebView.