Since update unable to launch Thunderbird at KDE start, although the user/.config/autostart directory include thunderbird.
SM
Changing thunderbird %u for usr/bin/thunderbird solved the problem.
SM
Strange nevertheless.
Might be something to look out on bugs.kde.org if already reported. If not then report.
(9th October 2016, 11:46)leszek Wrote: [ -> ]Strange nevertheless.
Might be something to look out on bugs.kde.org if already reported. If not then report.
.
Done, Bug 370359
SM