Locked out of machine after coming out of sleep mode (passwd not accepted)

info macbook (intel) 10.5.1 (was upgraded from Tiger)
single user setup
after waking up machine or coming out of sleep mode (i.e lifting lid) occasionally cannot login at all, password is refused. Multiple failed attempts. Its not a problem of caps lock on.
Only solution is to force power down of machine and then OS comes back up, HOWEVER, without demanding a password after power up (hardly very secure), afterwards it may work OK for a few days (with a number of sleep cycles) before same login problem happens again.
Is this a known problem?

Please do both of the following:
1) Turn the computer off. Press and hold shift. Turn the computer on. Continue to hold shift until you see the spinning gear below the Apple logo. Once it is started up, log in. Does it do the same thing here? If it works, please know this is not a fix, just an isolation step.
2) Test this in another user account on the computer. If you don't have one, create one in: Apple menu> System Preferences> Accounts. Click the lock in the lower left corner if it is locked and enter your password. Click the + just above the lock and type in "test" for all the fields it asks for. If you are on 10.4 or earlier, check off "Allow user to administer this computer". If you are on Leopard, make the account type an Administrator. Click "Create account". Click the Apple menu and select the last item ("Log Out" Account name). Log in as the test account and test. Note: You will have to set it to ask you for a password when waking from sleep (Apple> System Prefernces> Security> Require password to wake this computer from sleep or screen saver)
Let me know the result of those tests. Please make sure to try both, as they will allow me to see what may be causing the issue.

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