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David, If you are using custom html tags and JavaScript in the webapp. Then never navigate to the visual editor tab of the web app. Whenever you will open the page activity by default it will open the visual editor tab. Try to navigate to source tab as soon as you open the page activity. As the visual editor tab tries to identify the tags and then remove the unrecognized tags. I believe you are facing the same issue. I always make a back up of html before saving the webapp and then always make the changes in the local back test it on browser and if it works then just paste the code in source tab and publish the web app. Never try to preview the content on webApp visual tab.

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