According to the dashboard on Dropbox.com, I am using 1.39 GB out of my 2.75 GB quota. This almost matches the space used on my local disk (1.38 GB).
However, when I try to join a folder of size 1 GB, I am told that "Your account is out of storage", and I only get the offer to upgrade my account. The upgrade page incorrectly states that I am "Using 1.37 GB of 2 GB space"
How can I join this folder, which is within my quota?