Most likely after changing your nickname Winamax did change the location of the Hand history folder. So you have to update Hand2Note-> Configurator-> Autoimport settings and add updated Winamax hand history folder.
1) Please make sure that you are using the latest Hand2Note version which is 3.3.1.32 If not here is the guide how to update
http://hand2note.com/Help/pages/Upda...rsion-updating
2) In Winamax client please open Tools->Options->Game
3) After please add this folder inside Hand2Note autoimport settings