running well or running fine?( urgent !!!)

[bosun]

Please if you find any mistakes, could you mark and change them for me?
1. The new web service is running well.( running fine?? which one sounds better?
2. I am looking forward to your reply conceing my inquiry of June 3.
3.My department has been working on serious damage( or problems?) after we exported products overseas.
4. It was a life or death situation for our company to deal with. Hopefully you will understand this whole abrupt situation we were in.

[Tdol]

1 I'd use 'well', though 'fine' works
2 concerning
3 problems or damage to products we exported (no need for 'overseas')
4 abrupt- unexpected??