Maps disappearing entirely.

Detailed Description of the Problem: When I zoom in or out (ctrl+mouse wheel) or change tabs, the map just disappears. In game I can still voice chat and my players are still in game. I can replicate on two different computers. Attached screenshots.  Computer 1:  Windows Vista / ChromeVersion 29.0.1547.62 m Computer 2: Windows 7 Enterprise / Chrome Version 29.0.1547.62 m BEFORE: AFTER:

Ctrl+Mousewheel is browser level zoom and can cause problems with Roll20. This appears to be one such problem.  I suggest you reset your browser zoom to 100% and refresh to get things back to normal. Then use Alt+mousewheel or the zoom tool instead. :) - Gauss

Same thing happened to me today -  All the pages were still there and the handouts. I could even select tokens if I guessed where they were. But all the images on all the page became invisible. I was using Chrome on a windows 7 PC They were working, then I did CTRL and Mouse Wheel to zoom out, then the map screen when blank. I  exited and came back in, still gone. I returned zoom level to default. still no maps. Then I logged-in as a player (using Safari) and the map was there. Then I logged-in as GM again in a new Chrome Window and all the maps were there again. I've now switched to ALT+mousewheel and seems to be OK. I also noticed that with dynamic lighting, as a Player, if you CTRL+mousewheel, sometimes you get a flash of the entire map as it redraws.