Thank you for your reply. However, your suggestions did not resolve the issue. Also, I had already tried to run the following utilities:

File > Utilities > Repair File and Network Problems

File > Utilities > Verify Data

File > Utilities > Rebuild Data

When I ran the "Repair", no errors were detected. When I ran the "Verify", errors were found, but none seemed to be related to my issue. When I ran the "Rebuild", everything ran successfully and all errors were fixed.

After all of that... my problem still persists.