quartus4.1 vs quartus4.2

I have use quartus4.2 a few months.But the quartus4.2 so many bugs.

and where quartus4.2 stronger than the quartus4.1.In the quartus4.2

the component edit so rabbish and so slow .Now the modelsim can't work

errors,I don't know the reason is the quartus or modelsim???