This sounds a bit more ominous. First of all, are you certain that you’ve opened the right project file? You can check the location of the project file by right-clicking on the project name and selecting ‘Show project file’ to open it in Windows Explorer. (If you’re certain that this is the correct file you’ve been working on, let’s take this opportunity to make a backup copy before you do anything else.)
Apart from the project name, are all your project’s tags and lists visible in the sidebar? If they are, it’s possible that you deleted all items by accident. If that happens, Tropy will preserve your items for a few months before deleting them for good, so if you look at ‘Deleted Items’ and you see all your items there, just select them all, right-click on the items and restore them from the context menu.
If your tags and lists are not there, then I would guess that this is not the correct file. There’s no way to inadvertently delete all items, lists and tags in a project, so if there’s only the project name an nothing else, I think you’ve opened a wrong file by accident (or maybe created a new project with same name). In this case I would check your recent projects in the file menu or look for the project file in Windows Explorer. If you are certain that it is the correct file and that there is something wrong with it, we’re happy to take a look at it if you send us the file (the project file contains information about the most recent times it was accessed, so it should be easy to determine if it is indeed the file that was used prior to the update).