Upon changing the Show pop up menu on a custom Insert File dialog box it will kick you back to the Desktop if you have drilled down through a series of folders.
Steps to reproduce the problem
1. Start by creating a container field on a layout.
2. Attach a button to the field and choose a custom filter for the Insert File Options. Add a few custom items such as pdf, jpg, gif, etc.
3. In Browse mode click the button and drill down through a few folders.
4. Change the Show pop up menu to a different value and it will kick you out of the folder and all the way back to the desktop.
If you had to drill down through several folders to get to the file that you want you have to drill down again if you forgot to change the Show option before you started.
There really isn't a work around other that you have to know the exact file extension you are looking for up front and change it before you start drilling down through the folders. Otherwise, it's a complete nuisance to have to do it more than one time.