Make sure that you give each movie clip, that has an Editblock component attached to it, a unique instance name AND make sure you give each parent movie clip, in the path to the Editblock, an instance name as well. Otherwise content will get orphaned. Each Editblock needs an editblockID. This can be achieved on one of two ways.
1. Give each Editblock an editblockID through the component inspector.
2. Or the editblockID will be created for you from the path to the Object that has the Editblock attached to it. If you take this route then make sure that each Object, that has an Editblock attached to it, has an instance name. Also make sure that each movie clip in the path to each Object also has an instance name. So for example if you have an Editblock attached to a text field and that text field is in a movie clip then make sure that both the movie clip and the text field both have instance names. If you have not entered an Editblock's editblockID then the entire path needs to be named because it will become the editblockID.
You can find more information here:
1.
http://flashblocks.com/FlashblocksML/ReadMe.php#trouble_loosingData2.
http://flashblocks.com/FlashblocksML/ReadMe.php#componentEB_editblockID