I'm having the same problem.
Before the last upgrade to 11.01 I was having very long flights. Now I'm often getting frozen screen then a window sending report to X-plane, or just the programme quitting. However I also still get some reasonable flights Just after my last short flight when the screen froze and then I was able to comment on the report to X-plane, I followed with an uneventful flight in the ASK21 glider launching from Gold Coast Airport YBCG (Australia) to 2000' and then flying across to Mount Warning then down to land at Tyagarah YTYH (just north of Byron Bay).
I'm hoping the gurus at X-Plane will get the problem sorted soon.
They've made such a fantastic programme so far. The glider flying and thermals are so realistic I think I'm 20 years younger flying the real thing again! Great practice centering thermals - keeps you on your toes.