When I receive some invitations (particularly flight detail), I can not read the detail, everything is hide somewhere. When I transfer the message, I can see the "main body". I do not know if it is the companies which does not follow a protocol, but it is quiet annoying. I have try on Linux and Windows the problem is still there ( using Thunderbird Version 60.7.0, for Windows). Is it possible to change any setting to see the core message?