When using the report designer on the linux version of AwareIM changing the band height using the mouse isn't possible. I can drag /drop the band but then I have 2 band headers (the original and the dropped) and no resizing takes place. Drag/drop of the last band (e.g summary) optically works but isn't reflected in the height property.
Thanks for reporting this, we will investigate it. In the meantime, please use the band dialog to set the height value numerically. You can bring up the band dialog by right-clicking the band header.