First, we recommend that you turn on File Extensions as explained here. 

In the Corsstab Callouts form, make sure you choose the correct database used to share data between the Viewer and Enviro Spase 8. This database id EnvDView.MDB and should be located in the EData8\Database folder. Make sure you have not choosen the Viewer file which is EnvDDate8.ACCDB. This will be easier to located with file extensions on and not hidden. See graphic below with the incorrect folder and file path.