If this is only happening for some of your favorites, then a possible reason is that the favorites were created with leading zeros (007 or 07 as opposed to 7). This will be fixed in a future version but for now the solution is to create a new favorite without any leading zeros.
If this is happening to all channels or channels that do not have any leading zeros in them then please see <a href="/faq/index.php?action=artikel&cat=3&id=6&artlang=en">this FAQa> for another possible solution. It is also possible that you have designated a specific receiver to use for the <a href="/faq/index.php?action=artikel&cat=3&id=14&artlang=en" target="_blank">Mini-Guide sourcea> but that receiver is no longer available. If this is the case, you can try changing the Mini-Guide Source option back to the default (current receiver).