The release notes for HummPC version 4.4.6 show:
HumminbirdPC (Version 4.4.6)
Release Date: 09/24/2014
Description:
Version 4.4.6 - Adds support for the following models
398
541
678c HD
678c HD XD
678c HD DI
688ci HD
688ci HD XD
688ci HD DI
698ci HD SI
859ci HD
859ci HD DI
859ci HD XD
899ci HD SI
959ci HD
959ci HD DI
959ci HD XD
999ci HD SI
1159ci HD
1159ci HD DI
1159ci HD XD
1199ci HD SI
HELIX 5 Sonar
HELIX 5 DI
HELIX 5 Sonar GPS
Therefore, unless you have one of these new model units it should not make a difference that you are running the previous version. However, the previous version was 4.3.8 which fixed a problem with the 4.3.3 version that you are running. The problem was if you imported waypoints with the same names or locations, HumminbirdPC could get “confused”.
So I recommend that you update to the current 4.4.6 version to get all the latest bug fixes.