Unable to start Cygwin64 terminal after password change

[Lavrentiev, Anton (NIH/NLM/NCBI) [C]]

> $ head /proc/version

It seems to be not much different from the 'uname -a' output I showed earlier, but here it goes:

$ head /proc/version
CYGWIN_NT-10.0-18363 version 3.2.0-340.x86_64 (corinna@calimero) (gcc version 9.3.0 20200312 (Fedora Cygwin 9.3.0-1) (GCC) ) 2021-03-29 08:42 UTC

> getent passwd $USER

NCBI_NT+User(1606)@NCBIPC9135 /cygdrive/c/WINDOWS/system32
$ getent passwd lavr
lavr:*:1050182:1049089:U-NCBI_NT\lavr,S-1-5-21-2137354491-1741569864-122644288-1606:/home/lavr:/bin/bash

There's no stray /etc/passwd that might have gotten in the way, either:

$ cat /etc/passwd
cat: /etc/passwd: No such file or directory

BTW, $USER is not defined in the bash environment (not sure if it should be)

> net user $USER

$ net user lavr
The user name could not be found.

I don't have local users on this PC except for two maintenance accounts ('net user' shows them,
but they are not mine, and they are for our systems team, who administrates the machine).

My account is a domain account here.  And everything worked before I had to change my password.

TIA,

Anton Lavrentiev
Contractor NIH/NLM/NCBI