Thanks for helping. I have selected only one source - Sky Astra2 28.2 under the OpenTV providers tab.
When I press blue -> CrossEPG downloader it sometimes does a full download. It completes the process to the end with all channels updated correctly. Occasionally it won't work at all, it just hangs. But what I really want is a reliable overnight download, and this I find fails with CrossEPG more often than it works.
Reading elsewhere I understand that the VU+Duo is resource hungry and that a swap file might help. But I am having problems setting up the swap file - that problem really ought to go in a separate thread as this is a generic thread on CrossEPG.