I am on macOS Mohave, 2.4 GHz Intel Core i9, 32 GB 2400 MHz DDR, Radeon Pro Vega 20 4 GB
Intel UHD Graphics 630 1536 MB, and i have the same issue. Have not received a solution either.
2021-04-12 10:24:59 xtcas[xplane.c:678]: This is X-TCAS version b4a4bb2 (confopts: VSI:0 STYLE:1 GTS820:1)
--=={This application has crashed because of the plugin: X-TCAS/mac_x64/X-TCAS.xpl}==--
Still waiting for someone from the support team to help me overcome this problem.