The Mech Factory offers a complete, searchable, categorized database of Classic Battletech mechs, battle armors, combat vehicles and protomechs, with all relevant stats, histories and record sheets. It provides information about all Battletech components and their board game rules too, and contains brief descriptions about the CBT powers, fractions, clans, worlds and history. Beside the library the app features a complete Mech and Combat Vehicle Editor, a Roster Editor, a Virtual Record Sheet system and a simplified combat trial simulation to test out new or existing designs.
First time you use this app, a simple graphical tutorial will help your initial steps.
Because this app uses the database of the Mech Factory (http://battletech.rpg.hu), it requires internet access to download larger texts or pictures. After you downloaded a design, it will remain on your device, and it will be accessible offline. To enable content downloading you have to register your free account on the Mech Factory (if you don't have it already). With a valid Mech Factory user name you can use both the web page and the mobile app.
(As a quick fix, please try to uninstall/install, and then register. It might help. Be sure that you are online during the registration process.)