I'm not sure if this is a bug or does someone else have this problem, too? I couldn't find a bug report...
While using Chrome working on task details it looks like the details and also in the task list are not always up to date or correctly refreshed. If I add labels these labels are not always visible. Also when deleting labels, label information still appears in the task details or task task list.
Only after a manual refresh wit 'F5' details are is correct.
I think this is part of the more general "auto refresh" problem. We will implement this soon.