You're right, same problem.
For me (using Chrome in either OSX or Windows7) when the dialog box opens after clicking the insert-image icon, "http://" is already selected, so if I just paste into the dialog box that opened without clicking anything, it inserts the URL I've already selected in place of the preset text in the dialog box.
Il Carriaggio 1975 Argosy 24 | Il Progetto 1976 Argosy 28 Center Bath | WBCCI# 15566
He has all of the virtues I dislike and none of the vices I admire. Sir Winston Churchill