Copies of template keep breaking

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I have spent hours creating a drawing template for our company. The template has assembly, storyboard, component, and sheet metal placeholder views that preview as a generic 3-component assembly.
In the title block, I left a space for the client's logo and name, so I want to make a copy of this generic template, add a client's logo to the title block and then I have a nice template to use for all their drawings.
I copied the template, renamed the copy, added the logo and name to the title block, and saved a version. All looked fine, but then I closed the template and re-opened it a few minutes later. Now as soon as I switch pages from whatever opened first to another sheet, all the placeholder views are replaced with red squares. This happens for all the views except for the sheet metal flat pattern.
I've tried a few things, but every time the same result. Any ideas what's going wrong?