Materials have disappeared or stopped working
One of my materials I have been working on for the past couple of days has stopped functioning (is titled "Eigenvector"), and another has disappeared completely (was titled "Eigenvalue"). When I try opening Eigenvector with the GeoGebra App, I just get a message saying "Opening file failed". Viewing Eigenvector as a Worksheet results in the Geogebra applet portion not loading. I don't appear to be getting any other more detailed error message than this, so if someone knows how to help me find additional information (or how to revert/recover my materials, as I had them both working exactly how I wanted), it would be much appreciated.