I've just tested: works for me.
It could be clash with keyboard layout switching, kglobalaccel or lxqt-globalkeysd.

On 21 June 2014 06:16, Александров Петр <petr_aleksandrov@mail.ru> wrote:
Alt+Shift+<Letter key> combinations seem not to work in KDE apps under
LXQt. For example if I bind Alt+Shift+M combination in Kate and press
it, letter "M" is written under LXQt. Under LXDE (Gtk version) this
combination works well (the binded action is done).
Kind regards, Petr.

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