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When changing scenarios the following error message is generated: Value does not fall within the expected range.
Try the following steps to see if they work.
First, close the model files but leave the program open. Go to Tools > Database Utilities > Compact Database and select the database file. Next, choose the selection to purge the database to save space. Once that is completed, try opening the model to see if that helps.
If that doesn't help, try moving just the .wtg and .wtg.mdb file to a new folder location. At times, one of the supporting files can cause an issue when opening a model. Open the model from the new file location and see if the error occurs.
If the issue still occurs, import the database file into a new drawing. To do this, go to File > Import > WaterGEMS/WaterCAD database. Select the database file associated with the model.
You can also try restoring a backup of the model using the steps in the following link: http://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/8842.can-i-restore-a-backup-of-my-projects