User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:7.0a1) Gecko/20110627 Firefox/7.0a1 Build ID: 20110627030739 Steps to reproduce: 1. Turn off layers acceleration: change the layers.acceleration.disabled variable to true in about:config 2. Restart the browser Actual results: Canvas content is not shown at all. This only happens when Azure is enabled.

Confirmed last m-c hourly http://hg.mozilla.org/mozilla-central/rev/7dba94aaa160 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:7.0a1) Gecko/20110627 Firefox/7.0a1 ID:20110627055536

Hrm, I'll look at this, I'd like to emphasize Direct2D without D3D10 layers is an unsupported combination that has other problems although they don't always show. So I'm not likely to give this high priority unless someone objects.

How about making D3D10 layers a hard requirement for D2D, then?

Well, this bug might be more serious. These canvases also need to work with BasicLayers, the fact they apparently don't could be a real problem for situations where they need to be drawn to basic layers.

We're going to stop tracking this for 7 because it is an unsupported configuration and most/all users won't get in this state.

Is this bug still reproducible?