Hi,
Sadly I have had to go back to the previous VNC as UltraVNC locks up when using DDE on the remote (10/100 network cable) PC.
I have two applications running on the remote (w2000) and one passes selected data to the other. The local PC is using Vista Home Premium.
Using the Viewer I have both apps running on the remote and I then click on a data field in the first app and it passes the data to where the cursor last had focus in the second app. It then advances the cursor to the next field in the second app and waits for more data from the first app.
After transferring 4 separate fields of data, the remote locked up. I went to the remote PC and tried to shut down UltraVNC but the entire system had frozen. I had to turn it off at the power supply and restart it. I repeated this 3 times and always at the 4th or 5th transfer it would lock up. I also tried once with the DirectX viewer, same result.
The first app is an in-house Delphi application using "SendKey" to send the data, the second app is a commercial product. The system has been working fine for 12 months. With the former VNC re-installed it is back to working.
There is a lot more to like with UltraVNC but sadly we have to revert as this system is used many times each day to process sales. I sure hope you can figure out what is causing the problem and fix it.