HP bar flicker + DC at Zakum

Description of the bug: I've had this happen four times now all during 3rd body phase of Zakum. During Zakum the boss HP bar will suddenly flicker invisible and visible and other graphical errors will happen like my character's body will flicker invisible and visible except for my face. Also inconsistently I can't use skills or items when the bug starts but sometimes I can. UI panels don't show up when opened and will inconsistently cause instant disconnect or graphical errors as shown in the pic. Even the disconnect is inconsistent with either booting me to login screen or just closing the client or giving an actual runtime-error program crash.

Look closely at the graphical errors over Zakum's body.



^( ? __ ?)>

After disconnect to login screen. I didn't get a pic of the one time that I got the runtime-error but it's the typical message for C++ library runtime-error.



What is supposed to happen?: Normal Zakum with no dc.

Where did you find and/or notice this bug?: During Zakum.

A step-by-step guide to re-producing this bug (optional): Run build 22/1/2018 rev.2 in windowed mode from MapleLegendsWindowed.exe. Run Zakum to 3rd body and experience disconnect.

Extra information (optional): This has happened to me before and after the 22/1/2018 patch and before and after reinstalling a clean client. Other programs open at the time were Discord only.