What do you exactly mean by open a different page? If on Sigil you launch PageEdit using the XEditor button, it passes along the opf to PageEdit so that you then use the PageEdit icon arrow keys (or pulldown menu) to quickly change to any other xhtml file in the epub directly in PageEdit.
Once you have made all of your changes to any xhtml page and saved them you shoukd then close out and exit PageEdit.
That is how it has always worked.
So which steps of the process described fail for you?
Are you by chance just editing one page and then closing instead of saving it, never navigating to other pages directly in PageEdit, and never fully quitting out of PageEdit?
If you can supply an exact sequence of steps (which icon used, which menu used, etc) that worked in recent previous versions of PageEdit (1.9.x or 2.0) that no longer works in PageEdit 2.0.2, I would be happy to look into it.
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