Scanning sometimes reports failing to find / add item, but it is in fact added

[GoogleCodeExporter]

What steps will reproduce the problem?

1. Scan item
2. Be told that Shelves cannot find it to add to the database
3. Look in database, see it has been added.

Intermittent problem. 

What version of the product are you using? On what operating system?

2.6.2, Froyo 2.2

Please provide any additional information below.

This may be related to the size of database - there are over a thousand entries 
in this one already.

Original issue reported on code.google.com by lovingb...@gmail.com on 15 Oct 2010 at 1:55