ProtocaseDesigner.com

I have recently upgraded to Protocase Designer 4.1.9 and I cannot import a .cas file generated by an earlier version. It can be seen in the browser, but when you click on it nothing happens.
Any help gratefully received

If you send me this file I will fix whatever issue exists and make it work.

I'm sorry I didn't reply sooner, the notifications on this forum haven't always been working.