Duplicate items appearing in session

A user was receiving an error message from a validation indicating that a value had not been specified for one of the page items when the user had, in fact, provided a value. While investigating this problem, I discovered that the user's session contained two copies of most of the page items.
I have been able to reproduce the problem using the standard APEX Sample Application using the following steps.
1. Install Sample Application.
2. In the application properties, rename the application so that APEX will allow a second copy to be installed.
3. Create an authentication scheme based on the preconfigured authentication scheme "Oracle Application Server Single Sign-On (Application Express Engine as Partner App)".
4. Make this the current authentication scheme.
5. Run the application; log in; access some pages to establish some page items in the session. (The application didn't behave normally, but that didn't affect the results.)
6. Save a copy of the URL, including the session ID.
7. Install a second copy of Sample Application.
8. Repeat step 3 for this second copy.
9. Export the second copy.
10. Import and install the file just exported over the first copy of the application (i.e., change its ID to that of the first copy during the installation).
11. Log in to the first copy of the application. (The session ID should be the same after logging in as in the saved URL.)
12. Access some pages in the application. The session should now contain duplicates of the page items.
These steps are contrived, but the problem arose from actual experience. The user typically uses a shortcut that contains the session ID and had previously accessed the application recently enough that the session had not yet been purged. Between those two accesses, I had installed a new version of the application from our test server where the application has a different ID.
Any suggestions for ways to avoid the problem?
Rodney

Rodney - I understand the scenario better now. I didn't realize the timeframe was so elongated (user logged out and went home, then you did the maintenance, then user returns and logs in and uses a bookmark, etc.). It's an interesting problem and I thank you for your detailed presentation and tolerance of my curmudgeonly reaction.
One thing you could do is login as a workspace admin and follow the path Home>Application Administration>Manage Services>Session State>Recent Sessions. On this report, you'll see a column New Instance. If you see the application ID that you want to replace in this column (perhaps following a colon (:) or in a colon-separated list of IDs), you can drill into that session and remove the session. Repeat until all such sessions are removed.
An alternative would be to alter the application's logout URL (actually the logout sequence) to invoke the apex_util.clear_app_cache (or htmldb_util.clear_app_cache) procedure as one of the steps. This would solve the problem for users who take the trouble to logout using the logout link and not for those who just close the browser or turn off the computer.
Another way would be to expire the session after some period of inactivity forcing the user to login again and get a new session. Example at http://htmldb.oracle.com/pls/otn/f?p=18326:44:610327603940451::::P44_ID:1562. This would be the simplest approach although I haven't tested it for your scenario. I'm sure it could be adjusted for that case if necessary.
Scott

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bump

Duplicate items appearing in session

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