Unable to create an incremental backup after a successful full backup

I am running the most recent version of Acronis TrueImage 2010 on a Windows 7 64-bit machine. I am using a backup location on another Windows 764 bit machine on our home network. I can create an additional full system backup to that location however I have not been able to set up a follow-up incremental backup.

What happens is that I set up the incremental backup first by creating a "data" backup. On the next screen I indicate that I want to set up an incremental backup. On that screen I can "browse" across the network and locate the original full backup. When I click on this application suggests that I authenticate the connection. I am able to do that. Sure is where the problem occurs. After I select the full backup and proceed I get a screen which allows me to add comments and offers the "browse" button again. The application appears to have forgotten the location of the additional full backup. I cannot "okay" beyond this screen. The application appears expect me to browse back and find the original backup again.

The path to the backup location is
\\Mediacenter\o\Acronis Deb-Win7\-Deb-Win7-first set up-October 2010-.tib
I would appreciate any help in figuring out what I am doing wrong. Thank you in advance.

Kevin.