There has been an error reading or writing the file '.'
A quick Google search turned up KB281865 on Microsoft's site, but that only helped by confirming that this is a known issue. I was seemingly unable to get into the configuration dialog box to effect the fix, so not sure what to do.
The fix that worked for me was to view the report and wait for the error dialog saying There has been an error reading or writing the file '.'
to appear. Then, I positioned my mouse over the Customize... button and hit enter to dismiss the error dialog. Immediately after closing the dialog, I clicked the Customize... button, and the report customisation dialog popped up. After resetting the report using the Reset button, I was good to go!
Note that the Money 2005 Deluxe comes out of the box as version 188.8.131.525, so upgrading to version 184.108.40.2065 requires the installation of a QFE (aka SP1). This used to be downloaded automatically by money, but now must be downloaded directly from Microsoft here.