troubles after updating from 7.4.2 to 7.4.3

hello,

just for testing/programming (jdbc) purposes i used to start and stop my
postgresql 7.4.2 with two script files.

after cygwin-update the new version 7.4.3 is installed and my db won't
start any more!!

has it something to do with my scripts?
my start-db-script is:
#!/bin/sh
echo
echo "IPC-Daemon starten..."
ipc-daemon2 &
ps -f
echo
echo "PostgreSQL starten..."
postmaster -i -D /usr/share/postgresql/data &
ps -f


my stop-db-script is:
#!/bin/sh
echo
echo "PostgreSQL stoppen..."
pg_ctl stop -w -D /usr/share/postgresql/data -s -m smart
ps -f
echo
echo "IPC-Daemon stoppen..."
kill $(ps -f | grep ipc-d | awk '{print $2}')
ps -f

there is simply no error-message after my install-script, but i can't
connect to the server any more.

please help me! i must say that i'm a bloody beginner with postgresql!
greetings
hans