The following bug has been logged online:

Bug reference: 2797
Logged by: yyang
Email address: yang_yongy (AT) 163 (DOT) com
PostgreSQL version: 8.1.3
Operating system: windows 2000
Description: Command: Listen and Notify
Details:

Postmaster server is started successfully.
I can select and update tables by psql.exe,
but failed to listen and notify.
For example,
Listen abc;

error msg:
invalid page header in block 3 of relation "pg_listener"

pls help me, thanks a lot.

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TIP 2: Don't 'kill -9' the postmaster