Segue citação da solução:
I've searched for a resolution with image-problems, too.
Maybe this will help:
Product functionality change.
From QlikView 12.00, it has been decided that access to images should be restricted by default. The behavior may be changed via an 'Easter Egg' setting:
AllowGeneralAccessToImagesThroughURL=x, where x is one of the following values:
0 = No access at all
1 = Access through "http://" possible (default from now on)
2 = Full access (same behavior as in 11.20)