Bugzilla

I am just a facilitator in this process - I've never seen it, plus I'm new to Mac and in truth only part time (using an Air circa 2012 with "ntel HD Graphics 4000) with "Use hardware acceleration" disabled.

For the cohort in bug 1381485 who regularly experience the issue reported there, the current working theory is this happens mostly (but not exclusively) on older Macs with integrated graphics and "Use hardware acceleration" enabled, i.e. "layers.acceleration.disabled", false, which is NOT the default for Thunderbird.  The default is "disabled", unlike Firefox where the default is enabled (depending on hardware I guess).

There are a couple people like Scott in bug 1381485 comment 316 who can easily reproduce and seem technically adept.

Does that help?  What additional information do we need?  And, if you are not the person able to help debug this graphics issue, who is?

I am just a facilitator in this process - I've never seen it, plus I'm new to Mac and in truth only part time (using an Air circa 2012 with Intel HD Graphics 4000) with "Use hardware acceleration" disabled.

For the cohort in bug 1381485 who regularly experience the issue reported there, the current working theory is this happens mostly (but not exclusively) on older Macs with integrated graphics and "Use hardware acceleration" enabled, i.e. "layers.acceleration.disabled", false, which is NOT the default for Thunderbird.  The default is "disabled", unlike Firefox where the default is enabled (depending on hardware I guess).

There are a couple people like Scott in bug 1381485 comment 316 who can easily reproduce and seem technically adept.

Does that help?  What additional information do we need?  And, if you are not the person able to help debug this graphics issue, who is?