This occurs when the project file did not close properly. When you open a project in SI 5, a temporary database is created in the folder where your project files are stored (default SI 5 project folder\clientname folder\project name folder). When a project closes properly, this database is deleted. If you navigate to the folder where this file is stored, you will see a file in there with the extension .mdb (assuming that you are showing file extensions). Delete this file. The project will then open.
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