Move to Trash - This item will be deleted immediately?

Click on the item in the Finder's sidebar with the house icon and verify that you are able to write to this folder in the Ownership & Permissions section of the Get Info window, and that it isn't locked; if it is already set this way and you get that error, open the Terminal in the /Applications/Utilities/ folder and run the following:

mkdir ~/.Trash

If you get a message stating that the folder exists, run the following:

sudo chown $UID ~/.Trash
chmod u+rwx ~/.Trash

The first command in the second set will prompt you for your administrator password; nothing will appear in the Terminal window while it is being typed. In either case, click on the Finder icon in the Dock with the Control and Option keys pressed, and relaunch it.

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Thanks, Niel, it worked for me, too.

This immediate trash deletion problem appeared on my computer after I installed Adobe CS5 Master Collection. Your solution fixed it. Many thanks.

I've just found this thread 'cos I've had this problem and it's been really bugging me.
Thank you Niel your solution worked a charm. Brilliant!

Thanks Neil - Fixed it for me as well. CS5 is definitely to blame for this problem.

Thanks! It worked also for me

Thanks for this. I guess Photoshop CS4 (or Photoshop Lightroom) will do it too.

Is there a difference between .Trash and .Trashes? Except for grammar:)

Thanks Niel...Regards, Chris

Thanks Neil. This fix worked for me too.

I have Adobe Photoshop CS4 installed.

i've tried this but i'm getting stuck at the password request. i don't have a master password for my system, but when i press return in the terminal (after the sudo command), i just get a 'sorry, try again' message...any idea what my problem is?

i don't have a master password for my system

Are you referring to the true "master password" that you establish in addition to your account password when you set up a FileVault account, or do you mean that your regular admin account does not have a password? If the latter, see:
*Mac OS X v10.5, 10.6: sudo command requires a non-blank admin password*
http://support.apple.com/kb/HT4103?viewlocale=en_US

To be sure you're getting the commands right, copy and paste them from the above post (spaces and punctuation do matter)

The password you're being asked for is your normal login password (admin password)

i have never set any passwords at all for my computer and i am the original owner. however, i figured out that sudo doesn't work without a password, so i went to my users account and set a password for myself so i could use it in terminal. however, now terminal doesn't work. when i open it, it remains stuck on the login screen. so now i'm trying to figure out how to get terminal to work again...