On my most recent engine, the twin cylinder opposed i.c. I tried to access the cam milling calculations on Cam-calc, and although it seemed happy enough to take my input figures, it popped up a note that it was unable to download them to my computer. I don't know if this was because something has changed at that end of things, or if it was unable to download them because of the anti-virus program I have running in the background on my computer. Can anyone shed light on this issue?---Brian