I got this error
„Application failure
XCOM crashed at 0x10001513 with error 0xC0000005 trying to access 0x027FFD2
and
XCOM crashed at 0x455BCA with error 0xC00000094”
The first happened at the base and the second happened when I shot down an UFO with an Avenger and I wanted to start the mission.
These errors happened with the 1.34beta4 version, and the Silacoids are too heavy to kill even with Plasma Rifle in this version.