Login Password - Allowed Characters?

Hey, the other day I had to work myself out of a bit of trouble; I changed the password for my admin account to my newly thought up super-password. OS X accepted my new password. Hooray!
Skip forwards 10 minutes, to see me with a panicked expression, attempting to log on with no success. My mind was racing - "Try the old one.. Try the new one (again).. Try variants of the new one; maybe you typoed.. twice! (hmm)".
Luckily, I had another (non-admin) account that I logged on to, and entered the "accounts" prefs, and changed my password back to my old one. Obviously, I had to enter my new password to do that, with no problems.
I wasn't entering the wrong password; the login prompt just wasn't accepting it. I logged out, and yep, old password worked fine. I changed my password to a new, simple password, login worked with it. I changed to a complex "good" password, login failed.
I narrowed it down to shift chars - !@£$%^ etc. If I used them, the password won't login, but will function within OS X just fine.
What's going on? I assume I'm either doing something stupid, or there's something wrong, because why would you be able to change your password to something that won't allow you to login?
Any ideas?!
Thanks, Ed

Ed look in the Apple help under 'system language'. That may do the trick. However my Macs were set up ab initio as UK, I usually find it as 'English International'. Could I also suggest you list all the passwords and check which characters might have a different IP send in US/UK. I am surprised you would have any there are few differences. This is typed on a standard (US) Mac Pro KB. I tried to one with UK key layout but couldn't. The KB is set to the Union Flag in the top right icon. All I recall doing on set up of the Mac Pro was choosing English as the install language as against (say) Spanish. As already said I use various passwords with shift modifier and have no such problems as you.
In the final analysis you could change the passwords using the install disk to avoid having to enter an existing PW, choosing characters that send the same in US as UK.

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resetpassword
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resetpassword
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Otherwise*, boot into Recovery mode. When the OS X Utilities screen appears, select
Utilities ▹ Terminal
from the menu bar. In the window that opens, type this:
res
Press the tab key. The partial command you typed will automatically be completed to this:
resetpassword
Press return. A Reset Password window opens. Close the Terminal window to get it out of the way.
Select your boot volume ("Macintosh HD," unless you gave it a different name) if not already selected.
Select your username from the menu labeled Select the user account if not already selected.
Follow the prompts to reset the password. It's safest to choose a password that includes only the characters a-z, A-Z, and 0-9.
Select
 ▹ Restart
from the menu bar.
You should now be able to log in with the new password, but your Keychain will be reset (empty.) If you've forgotten the Keychain password (which is ordinarily the same as your login password), there's no way to recover it.
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Hello,
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Help please

First, make sure caps lock is not on.
Another reason why your password might not be recognized is that the keyboard layout (input source) has been switched without your realizing it. At the login screen, you can cycle through the available layouts by pressing the key combination command-space or command-option-space. See this support article.
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Otherwise*, start up in Recovery mode. When the OS X Utilities screen appears, select
Utilities ▹ Terminal
from the menu bar. In the window that opens, type this:
res
Press the tab key. The partial command you typed will automatically be completed to this:
resetpassword
Press return. A Reset Password window opens. Close the Terminal window to get it out of the way.
Select your startup volume ("Macintosh HD," unless you gave it a different name) if not already selected.
Select your username from the menu labeled Select the user account if not already selected.
Follow the prompts to reset the password. It's safest to choose a password that includes only the characters a-z, A-Z, and 0-9.
Select
 ▹ Restart
from the menu bar.
You should now be able to log in with the new password, but your Keychain will be reset (empty.) If you've forgotten the Keychain password (which is ordinarily the same as your login password), there's no way to recover it.
*Note: If you've activated FileVault, this procedure doesn't apply. Follow instead these instructions.

Login Password - Allowed Characters?

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