Ahoy there,
Encountered a bug while attempting to place the Hardwood Sawmill just a few minutes ago while trying to use the latest Firefox build. The bug is that the entire Hardwood Sawmill 'icon' is missing when I tried to place it. All that appears is the "Cancel action" making the building non-placeable. Marble mason worked, Hardwood forester and woodcutter as well. Just not the sawmill.
Reloading page, relogging entirely and clearing history/cache did not do a thing.
I also tested this with IE build 9.0.8 (64 bit) and it worked just fine. It gave me the Uplay "Uplay is not available at this time" error for 4 times while trying to login however. (Also encountered that 4~5 times on Firefox before I managed to log in, so might be related. Figured I'd mention it)
Either way, I could place the Hardwood Sawmill on IE.
Psy.