I have this exact same issue since swapping from getting EPG data over the air to using XMLTV. I am using MP 1.0.2.0 with Streamed MP ... anyone find a solution?
Just wanted to say that I have the same issue, selecting certain guide items causes text elsewhere in the guide to disappear, in some cases the text ends up warped all over the screen. Its a little odd looking but not critical, as everything still functions fine. I am using the schedules direct plug-in and pulling episode and series data for import into TV series, so my guess is that it is this extra info that is causing text wrap issues. I may be able to solve this on schedules direct end as the extra info doesn't need to be displayed in the guide.