XEmacs crashes while entering gnus immediately after startup:

Fatal error: assertion failed, file c:\Hacking\cvs.xemacs.org\XEmacs\xemacs-21.4
\nt\..\src\bytecode.c, line 1479, abort()

NTDLL! 77f9180c()
execute_rare_opcode(long * 0x0082d594, const unsigned char * 0x0303ec62, int 0) line 1479 + 20 bytes
execute_optimized_program(const unsigned char * 0x0303ec40, int 3, long * 0x02927650) line 658 + 17 bytes
funcall_compiled_function(long 43836500, int 1, long * 0x0082d840) line 519 + 53 bytes
Ffuncall(int 2, long * 0x0082d83c) line 3572 + 17 bytes
execute_optimized_program(const unsigned char * 0x03067d18, int 17, long * 0x02e1ecb8) line 748 + 16 bytes
funcall_compiled_function(long 48937400, int 4, long * 0x0082db44) line 519 + 53 bytes
Ffuncall(int 5, long * 0x0082db40) line 3572 + 17 bytes
execute_optimized_program(const unsigned char * 0x0300f430, int 5, long * 0x02ff0a40) line 748 + 16 bytes
funcall_compiled_function(long 50577692, int 2, long * 0x0082de20) line 519 + 53 bytes
Ffuncall(int 3, long * 0x0082de1c) line 3572 + 17 bytes
execute_optimized_program(const unsigned char * 0x0300f3b8, int 4, long * 0x02d98f60) line 748 + 16 bytes
funcall_compiled_function(long 48391928, int 2, long * 0x0082e0f8) line 519 + 53 bytes
Ffuncall(int 3, long * 0x0082e0f4) line 3572 + 17 bytes
execute_optimized_program(const unsigned char * 0x03029350, int 7, long * 0x02e12a70) line 748 + 16 bytes
funcall_compiled_function(long 48059548, int 2, long * 0x0082e358) line 519 + 53 bytes
Feval(long 35685108) line 3392 + 20 bytes
condition_case_1(long 35587516, long (long)* 0x01072edc Feval(long), long 35685108, long (long, long)* 0x010701a5 run_condition_case_handlers(long, long), long 20613944) line 1652 + 7 bytes
condition_case_3(long 35685108, long 20613944, long 35587516) line 1733 + 27 bytes
execute_rare_opcode(long * 0x0082e618, const unsigned char * 0x03075b68, int 143) line 1273 + 19 bytes
execute_optimized_program(const unsigned char * 0x03075b20, int 5, long * 0x02e12908) line 658 + 17 bytes
funcall_compiled_function(long 48059520, int 2, long * 0x0082e8f8) line 519 + 53 bytes
Ffuncall(int 3, long * 0x0082e8f4) line 3572 + 17 bytes
execute_optimized_program(const unsigned char * 0x0303def8, int 9, long * 0x02dd5a78) line 748 + 16 bytes
funcall_compiled_function(long 48058736, int 3, long * 0x0082ebe4) line 519 + 53 bytes
Ffuncall(int 4, long * 0x0082ebe0) line 3572 + 17 bytes
execute_optimized_program(const unsigned char * 0x0082edc4, int 4, long * 0x02e23b58) line 748 + 16 bytes
Fbyte_code(long 48249540, long 48380744, long 9) line 2407 + 38 bytes
Feval(long 47626188) line 3335 + 187 bytes
Fprogn(long 47620260) line 775 + 9 bytes
unbind_to_hairy(int 12) line 4984 + 18 bytes
execute_optimized_program(const unsigned char * 0x02d99cc0, int 3, long * 0x02dd5038) line 761 + 259 bytes
funcall_compiled_function(long 48393440, int 3, long * 0x0082f320) line 519 + 53 bytes
Ffuncall(int 4, long * 0x0082f31c) line 3572 + 17 bytes
execute_optimized_program(const unsigned char * 0x028e4ee0, int 4, long * 0x029f5bf8) line 748 + 16 bytes
funcall_compiled_function(long 47593748, int 1, long * 0x0082f5f4) line 519 + 53 bytes
Ffuncall(int 2, long * 0x0082f5f0) line 3572 + 17 bytes
Fcall_interactively(long 20518592, long 20612792, long 20613944) line 941 + 22 bytes
Fcommand_execute(long 20518592, long 20612792, long 20613944) line 2974 + 17 bytes
Ffuncall(int 3, long * 0x0082f844) line 3536 + 127 bytes
execute_optimized_program(const unsigned char * 0x02966288, int 7, long * 0x0148cb28) line 748 + 16 bytes
funcall_compiled_function(long 21721372, int 1, long * 0x0082fb28) line 519 + 53 bytes
Ffuncall(int 2, long * 0x0082fb24) line 3572 + 17 bytes
Fcall_interactively(long 20509400, long 20613944, long 20613944) line 941 + 22 bytes
Fcommand_execute(long 20509400, long 20613944, long 20613944) line 2974 + 17 bytes
execute_command_event(command_builder * 0x021cc130, long 36793720) line 3924 + 25 bytes
Fdispatch_event(long 36793720) line 4218 + 70 bytes
Fcommand_loop_1() line 583 + 9 bytes
command_loop_1(long 20613944) line 495
condition_case_1(long 20613584, long (long)* 0x01052616 command_loop_1(long), long 20613944, long (long, long)* 0x01052030 cmd_error(long, long), long 20613944) line 1652 + 7 bytes
command_loop_3() line 256 + 35 bytes
command_loop_2(long 20613944) line 269
internal_catch(long 20441240, long (long)* 0x01052180 command_loop_2(long), long 20613944, int * volatile 0x00000000) line 1318 + 7 bytes
initial_command_loop(long 20613944) line 305 + 25 bytes
STACK_TRACE_EYE_CATCHER(int 1, char * * 0x00e64df8, char * * 0x00e631e0, int 0) line 2462
main(int 1, char * * 0x00e64df8, char * * 0x00e631e0) line 2832
mainCRTStartup() line 338 + 17 bytes
KERNEL32! 77ea847c()