Can anyone help?

I have recently started up DWMX2004 and about half of the sites which were listed as recently as yesterday are not now showing in the window, and I don;t have the option to manage these sites.

I have tried a backup and restore using MM-Exporter and this had not brought them back either.

I have looked at the file in MM-Exporter ...sites/site.reg using notepad and the sites are there still.

Does anyone have a solution for this?