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Tim, here is a direct Help link related to shared/tshared files, if you guys are still using shared files, you may want to convert the one in question to a tshared file and see if that helps or not as well as run the cleaning process on that one to see if the log shows any bad objects found etc. The only other thing of which I can think is if the only issue was a user created object not appearing, it was likely an issue in access to shared file, and if that was the case, the QVS Event log should have an entry in it about that time indicating there was an issue reading the shared file... About the only additional guidance I can give you on top of what Nadia provided.
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