When using a custom Photoshop action to resize and save JPEGs to my desktop, something keeps happening occasionally that leaves a locked TMP file on my desktop that can only be deleted by restarting iMac. It does not happen to every file, so I must be doing something every once in a while that causes the prob. I cannot move the file at all...not to a different folder or even a different location on my desktop. Cannot use "get info" to adjust permissions or unlock it. When I try to drag to trash i get this error :

"The item ?filename? can?t be moved to the Trash because it can?t be deleted. After restarting iMac, file disappears.

Using a new 27-inch iMac with 10.7.3 and Photoshop CS5.

Any suggestions?