One of our users encountered a problem with the Open dialog that appears when clicking the attachment (paperclip) icon in Gmail. The dialog would hang with the message "Working on it..." in the file/folder listing part of the dialog.

I don't know how long the user has tried waiting. Maybe a minute? If the user would click a different location such as Desktop or click the close button at the top right, the dialog would change to "not responding." I created a new folder (Downloads2) in the user's profile and temporarily moved all (about 800 items) but a few files from the user's Downloads folder to Downloads2. The Gmail attachment Open dialog worked normally again. I moved everything from Downloads2 back to Downloads and worked with the user to delete the 50 or so largest items. Even so, the problem had returned. The user then suggested deleting the most recent file, a Word document, he had saved to Downloads. After doing so, the Gmail attachment Open dialog worked as usual. I'm curious if others have encountered this or a similar problem and how you resolved it? I'm wondering how one would identify a possible problem file...? Thankfully the user thought to delete a recently downloaded file, apparently considering that the problem had only recently surfaced.