Close the database and set exclusive on, then open and modify

>Any of you seen this before?
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>I have copied from one database a set of stored procedures to another database. Both databases are in the same project. When I finish changing the new set of stored procedures, I will delete the original database.
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>At this time, though, when I select the new database (in the project manager), and select Modify, I get an error. I get "Record is out of Range".
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>Yet, when I open the new database up, from the Project, using Modify, and I right-click the database, I can select "Edit Stored Procedures", and I can edit the stored procedures.
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>Why am I getting the error message to begin with?
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>Thanks!