Error search led to:

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my details:

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nxagent -ac :1

NXAGENT - Version 3.5.99.16

Info: Agent running with pid '23287'.

Session: Starting session at 'Thu Jul 26 12:32:02 2018'.

Info: Using alpha channel in render extension.

Info: Not using local device configuration changes.

Warning: Cannot read keystroke file '/home/xxx/.nx/config/keystrokes.cfg'.

Info: using keystrokes file '/etc/nxagent/keystrokes.cfg'

Warning: ignoring keystroke 'viewport_scroll_up' (already in use by 'viewport_move_up')

Warning: ignoring keystroke 'viewport_scroll_right' (already in use by 'viewport_move_right')

Warning: ignoring keystroke 'viewport_scroll_down' (already in use by 'viewport_move_down')

Current known keystrokes:

close_session Ctrl+Alt+t

switch_all_screens Ctrl+Alt+f

fullscreen Ctrl+Shift+Alt+f

minimize Ctrl+Alt+m

defer Ctrl+Alt+e

ignore Ctrl+Alt+BackSpace

force_synchronization Ctrl+Alt+j

resize Ctrl+Alt+r

viewport_move_left Ctrl+Shift+Alt+Left

viewport_move_left Ctrl+Shift+Alt+KP_Left

viewport_move_up Ctrl+Alt+Up

viewport_move_up Ctrl+Alt+KP_Up

viewport_move_right Ctrl+Alt+Right

viewport_move_right Ctrl+Alt+KP_Right

viewport_move_down Ctrl+Alt+Down

viewport_move_down Ctrl+Alt+KP_Down

viewport_scroll_left Ctrl+Alt+Left

viewport_scroll_left Ctrl+Alt+KP_Left

reread_keystrokes Ctrl+Alt+k

Warning: SessionPath not defined

Info: Keycode conversion auto-determined as on

xkb_keycodes { include "xfree86+aliases(qwerty)" };

xkb_types { include "complete" };

xkb_compatibility { include "complete" };

xkb_symbols { include "pc+us" };

xkb_geometry { include "pc(pc102)" };

*** BUG ***

In pixman_region_copy: Malformed region dst