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Hey everyone, I am working on a backup function for a test executive. The backup uses the 'class to XML' vi to create an XML string and then save it to a file to be reloaded later. All of my test specific information lives in the class (or one of it's children). I like this functionality because it makes backup and reload brainless. It just works.... until now... I've got a test class for my current tester that's grown rather large. Everything works fine, until the tester loads some waveform data into either of the waveform arrays. Without data in this field the class reloads just fine, otherwise if fails and says the XML is corrupted. As you can see in my backup vi I have built in a work around that flattens the waveform arrays to strings, drops them back into the class private data, deletes the waveform arrays and then writes the class. This works! Much to my surprise both waveform data and the rest of the class data are written to file and reloaded without error. Does anyone have any knowledge or experience with this? Cheers, Tim