Still issues with NIS 2013?

I am using NAV 2013 and have no problems on WIndows 7 x64.  I never knew NIS 2013 had problems but saw some 2+ month old threads on this message board.  

 

What were the initial NIS 2013 problems?

 

Where the problems fixed, is it good now?

 

Were the problems only  on Windows 8 or all Windows?

 

Thanks for answers.