grid-auto-columns: inherit;

 grid-auto-rows: inherit;

 grid-auto-flow: inherit;

 grid-column-gap: inherit;

 grid-row-gap: inherit;

 grid-template-areas: inherit;

 grid-template-columns: inherit;

 grid-template-rows: inherit;

When I drag and drop a message from one account folder to another, the message often gets mixed up with another message. The subject and or the sender gets swapped with those of another message in the target folder. I've noticed this a few times in the last couple of weeks. When I open the Error Console, these errors all happened at the time I did the last drag and drop: Could not read chrome manifest 'file:///F:/Program%20Files/Mozilla%20Thunderbird/chrome.manifest'. Could not read chrome manifest 'jar:file:///F:/Program%20Files/Mozilla%20Thunderbird/extensions/%7B972ce4c6-7e08-4474-a285-3208198ce6fd%7D.xpi!/chrome.manifest'. While creating services from category 'profile-after-change', could not create service for entry 'Sapi Speech Synth', contract ID '@mozilla.org/synthsapi;1' Timestamp: 18/12/2016 19:23:03 Warning: Unknown property 'grid-auto-columns'. Declaration dropped. Source File: resource://gre-resources/ua.css Line: 175, Column: 19 Source Code: grid-auto-columns: inherit; Timestamp: 18/12/2016 19:23:03 Warning: Unknown property 'grid-auto-rows'. Declaration dropped. Source File: resource://gre-resources/ua.css Line: 176, Column: 16 Source Code: grid-auto-rows: inherit; Timestamp: 18/12/2016 19:23:03 Warning: Unknown property 'grid-auto-flow'. Declaration dropped. Source File: resource://gre-resources/ua.css Line: 177, Column: 16 Source Code: grid-auto-flow: inherit; Timestamp: 18/12/2016 19:23:03 Warning: Unknown property 'grid-column-gap'. Declaration dropped. Source File: resource://gre-resources/ua.css Line: 178, Column: 17 Source Code: grid-column-gap: inherit; Timestamp: 18/12/2016 19:23:03 Warning: Unknown property 'grid-row-gap'. Declaration dropped. Source File: resource://gre-resources/ua.css Line: 179, Column: 14 Source Code: grid-row-gap: inherit; Timestamp: 18/12/2016 19:23:03 Warning: Unknown property 'grid-template-areas'. Declaration dropped. Source File: resource://gre-resources/ua.css Line: 180, Column: 21 Source Code: grid-template-areas: inherit; Timestamp: 18/12/2016 19:23:03 Warning: Unknown property 'grid-template-columns'. Declaration dropped. Source File: resource://gre-resources/ua.css Line: 181, Column: 23 Source Code: grid-template-columns: inherit; Timestamp: 18/12/2016 19:23:03 Warning: Unknown property 'grid-template-rows'. Declaration dropped. Source File: resource://gre-resources/ua.css Line: 182, Column: 20 Source Code: grid-template-rows: inherit; Timestamp: 18/12/2016 19:23:03 Warning: Use of Mutation Events is deprecated. Use MutationObserver instead. Source File: chrome://calendar/content/widgets/calendar-widgets.xml Line: 495 James