hollunder: Hi.
I've recently played Nantucket on my desktop system without issues. Today I installed in on my laptop and it crashed on startup.

Software wise both systems are almost identical, up-to-date Arch Linux.
On the hardware side my desktop has a AMD card from last year and two 1080p monitors while the laptop is from 2011 and has a Intel HD 3000 and a 1366x768 display.

Symptoms:
...
displaymanager : xrandr version warning. 1.5
client has 3 screens
displaymanager screen (0)(LVDS1): 1366 x 768
Using libudev for joystick management
Importing game controller configs
./start.sh: line 16: 5229 Aborted (core dumped) ./"Nantucket.x86_64"

$ less ~/.config/unity3d/Picaresque\ Studio/Nantucket/Player.log
[xcb] Unknown sequence number while processing queue
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
[xcb] Aborting, sorry about that.
Nantucket.x86_64: xcb_io.c:263: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed.
...

Workaround:
LIBGL_DRI3_DISABLE=true ./start.sh

I found the workaround by searching around for the issue but didn't investigate the root of the issue.
Hope it helps someone.