Can't create encrypted disk image

With Leopard, I have repeatedly followed the instructions for using Disk Utility to make an encrypted disk. All appears to go well...all fields appropriately filled, including 128 encryption. But when I hit create, either nothing happens, or I get a second Disk Utility starting window. In any case, I am not asked to create a password, and am unable to find any trace of the disk I thought I'd just created. Would welcome your thoughts.

While creating, make sure that it's saved to the desktop so you will know where it is supposed to be, at least.. Was wondering if posssibly you lost them. Look for the named disks in your home folder and in HD on chance they are there somewhere.
I know you went to Help but just making sure you are creating disks this way (below). Everything worked fine for me--
If things still don't work, turn off DU and move to the desktop "com.apple.DiskUtility.plist" in your home folder/library/preferences. A new file will be created when disk utility is turned on again. Deleting plist files don't usually don't solve problems but sometimes they can become corrupted.
Good luck
RM
1 choose File > New > Blank Disk Image.
2 Type a name for the image, and choose where you want to save it.
3 In the Volume Name field, type a name for the volume that appears when you open the disk image.
4 Choose the size of the disk image from the Size pop-up menu.
5 Be sure you choose a size that’s large enough to hold any changes and new documents you might add.
6 Choose an encryption option from the Encryption pop-up menu.
7 Use the default settings for the rest of the options:
8 Choose “Mac OS Extended (Journaled)” from the Volume Format pop-up menu.
9 Choose “Single partition - Apple Partition Map” from the Partitions pop-up menu.
10 Choose “read/write disk image” from the Format pop-up menu.
11 Click Save.
Enter a password, and click OK.
Disk Utility creates the disk image and mounts its volume on your desktop.
Copy the documents you want to protect to the volume.
If you want to erase the original documents so they can’t be recovered, drag them to the Trash and choose Finder > Secure Empty Trash.

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