I was just prospecting in the first cave on greenreef
I got into a situation where the game kept failing every action, with message "Action failed: ... already in action" (or may have been "already busy" the text has gone now). The ... was various things including
Amthyst crystal [amethyst crystal[extract]]
Coal Deposit [Coal Deposit[mine ore]]
When I tried moving elsewhere, I'd get one step and then get pushed back to the amethyst crystal.
I tried shutting down the window and logging on again. This time double clicking on the amethyst or coal did nothing and I could move about 10-15 ft away from the amethyst before being instantly replaced at the amethyst.
As far as time: it happened just long enough ago to type this.
running on macbook air retina, OSX 10.8.4, Java 7.17