I had changed the media cache from my main OS drive to my drive with the most stoage.
How did you change it? You might try moving it back.
Given the timing (made the change; now it doesn't work), we have to suspect a corrupt Encore project.
This often means starting over.
Try the suggestions here:
Troubleshoot damaged projects in Encore on Windows
Try trashing your preferences in the default account. I don't know if you got to item 12 in that list, so here it is:
12. Re-create the Adobe Encore Preferences files.
Some problems may be caused by a damaged Preferences file.
To automatically re-create the Adobe Encore <version number> preferences file:
- Hold down the Ctrl and Shift keys while choosing Start > Programs > Adobe Encore <version number>. Release the keys after several seconds. The application will not start at this point, but the preferences file will be deleted.
Note: This procedure will not re-create the preferences for workspaces, zoom levels, or default library items. To do so, manually re-create the Adobe Encore <version number> preferences files.
To manually re-create the Adobe Encore <version number> preferences files:
Choose Start > Programs > Adobe Encore <version number> to start the application. New preferences files are created when the application starts.
- Delete the following folder: