We - my wife and me - are experiencing a strange phenomenon. She is using an Acer notebook under Windows Vista Home Premium, I am using a DELL notebook under Windows 7. The Internet access is fine on both computers. We can open different sites. But my wife wants to access several chat sites. Both computers have Java 7 / 25 installed. Interestingly, all three chat sites can be accessed from both notebooks, but the chat client does not start on both.
When clicking on the "Start chat" button, Java starts. After two minutes, the Java.com text appears and the part of the page where the chat appears normally remains empty. The end message is always the same: A ClassNotFound dialog opens.
What could be the reason for such a behaviour? To reduce possibilities, we stopped the WLAN (supplied from cable) and used my smartphone as Internet access. As expected, the result didn't change.
Until two hours before. all these sites were present.
Thank you for your suggestions!