OK you can also use dream explorer from the plugins to delete the EPG.DAT file
Press the green button on the remote, select dream explorer and let it load. Press ok to select list of storage devices, select the storage device that is not internal flash, move the yellow bar down to EPG.DAT and press red to select delete.
I would also delete the crossepg folder from that same screen.
Once done reboot the box and use crossepg to redownload the EPG properly