Cannot rename init file

Last night when I ran vacuumdb, I got the following output:

Vacuuming Administrator
VACUUM
Vacuuming template1
VACUUM
Vacuuming novell
NOTICE: Cannot rename init file /cygdrive/c/pgdb/base/164966/pg_internal.init.2772 to /cygdrive/c/pgdb/base/164966/pg_internal.init: Permission denied
Continuing anyway, but there's something wrong.
VACUUM
Vacuuming usda
NOTICE: Cannot rename init file /cygdrive/c/pgdb/base/167726/pg_internal.init.3156 to /cygdrive/c/pgdb/base/167726/pg_internal.init: Permission denied
Continuing anyway, but there's something wrong.
VACUUM

I got similar errors when I tried to perform db operatons using ejb/jdbc. I restarted the postmaster and the problem went away. Has anyone else seen this?

2nd unrelated (I think) question, I am noticing something funny when I run the postmaster with -d2:

postmaster child[2828]: starting with (postgres -d2 -v131072 -p usda )
FindExec: searching PATH ...
ValidateBinary: can't stat "/cygdrive/e./postgres"
ValidateBinary: can't stat "/cygdrive/e./postgres"
FindExec: found "/usr/bin/postgres" using PATH
DEBUG: connection: host=127.0.0.1 user=Administrator database=usda

Is the ValidateBinary anything to worry about?

I'd appreciate any feedback on either of these two problems.
Thanks,

Russell