Find Text stops after clicking on Impress sheet

I have created a power point file in PP 2007 which is an electronic schematic snipped from a document. I have added text boxes to the snip. I have opened it in Libre Impress and if i hit Ctrl F it searches and finds well. But when I click on the sheet, Find stops working and says search key not found. I saved it in ODP format but it behaves the same. Can anyone suggest what could be wrong?

Thanks Ian

or slide ?

Hello

It is a slide

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