I have same problem.
2018-05-26 09:50:40.562 INFO : MIG 21 ARC ERROR: Nav Data file is corrupted
2018-05-26 09:50:40.975 ERROR COCKPITBASE: Cockpit: failed to init geometry, pointer was not found.
2018-05-26 09:50:40.976 ERROR COCKPITBASE: controller "trimmer_stick_roll" missed in class cockpit::test_namespace::ccControlsIndicator
2018-05-26 09:50:40.977 ERROR COCKPITBASE: Cockpit: failed to init geometry, pointer was not found.
2018-05-26 09:51:22.032 INFO EDCORE: try to write dump information
2018-05-26 09:51:22.034 INFO EDCORE: # -------------- 20180526-095121 --------------
2018-05-26 09:51:22.034 INFO EDCORE: E:\S\DCSWorld\Mods\aircraft\MIG-21bis\bin\Avionics.dll
2018-05-26 09:51:22.035 INFO EDCORE: # C0000005 ACCESS_VIOLATION at 93BE2115 00:00000000
EDIT: On kavkaz works fine
Attached logs dcs.log-20180524-155513.zip