Quick tip from a Perforce newbie…
Sometimes, for whatever reason, Perforce might miss updates – additions, deletions or edits – and they simply won’t appear in any change-lists. The changes show up in a diff, but good luck trying to commit the changes.
The solution: right click on the file/folder in the workspace browser and select Reconcile Offline Work. A warning though – this diffs every single file in your selection, so an entire project or workspace may take several coffees.