It still a work in progress. It took me a while to figure out how to get in, until I realized that when you launch a mission that it open up in a different window underneath the one you are on.
Also try to choose missions that are green or yellow, it will run better.
HL Panzer III | HL Tiger | HL Jagdpanther | HL Panther | Mato Sherman
Hooben Elefant | HL Pershing | HL Bergepanzer IV | Tamiya Leopard 1A | WSN T-34
HL "Golden" Pan-Tiger | M16 Halftrack | HL Panzer IV | Tamiya KV-1 | Tamiya Tiger