Hello,
While creating a test campaign, I could successfully hide a map (jpeg image) with the fog of war tool, while on the other pages the hide areas function didn't work at all.
I could draw a dark rectangle but once the mouse button was released it wouldn't "darken" nothing. I tried to switch to all the three different layers before drawing an hiding area but to no avail. It kept working only on the page on which I used it for the first time since I created the campaign.
O/S: Windows 7 Ultimate 32 Service Pack 1
Hardware: Intel Core2 T7600 @2.33Ghz, 4Gb ram
Browser: Chrome 19.0.1084.52 m
Thanks,
Fabio