You might have a TV guide file (xml) with no stop times!
The
default setting is to ignore programme tags with no stop times.
View
the documentation of your grabber to see if including stop times is
an option (a parameter?) or contact your XMLTV provider. You will get
the best EPG quality if stop times are included in your file. If this
is not possible, check "Calculate" in "Missing stop
times" group when adding an XMLTV file.
If "missing
stop times" is not the problem please click the “Validating
xmltv files” link.