Hello,
after reading your post, we have checked both the newest 1.4.3 and 1.4.2. The Itemid excluding works fine in both.
However, please note that in 1.4.2, the default configuration was changed so "Exclude source id" is set to "No" by default. In previous version (1.4.0) it was "yes" by default.
Best regards,
ARTIO Support Team