You need to set one up, will solve your CrossEPG issues etc. here is how to do it;
Blue button, ViX, Swap Manager, blue button to create, go with the 256mb option on your usb which should be listed. After a few minutes you should see the swap place at the top which should have your media/usb/swapfile etc, then press the yellow button to Autostart, then press the green button to Activate. If done correctly you will have a tick and a green active box present.
Press the red button to close and then try doing a CrossEPG downloader (blue button and CrossEPG downloader) and you should find the EPG data will populate and your receiver won't get stuck anymore.
Hope this helps.