If your models appear red in the models viewer and aren't selectable it indicates that these models are no longer valid and will be archived the next time you open Arkio. Models can go invalid during complex modeling operations or when updating to version 0.8.0 from an older version of Arkio.
For our 0.8.0 release, we switched to a new file format so older Arkio models will no longer be compatible. Old Arkio models you still have will show up in the models viewer as not compatible, i.e. they will be marked red and won't be selectable. They will be automatically moved to an InvalidUserModels folder in the main Arkio folder and won't be visible the next time you open Arkio.
What if I still need access to my old models?
In case you still need to be able to edit or export your old models after the file format change in version 0.8.0 you can get in touch with us at email@example.com and we can send you a previous windows release of Arkio.