L.S.,
I just updated to 6.11.0 and saw my reports not working any more on our server. I'll have to find out the plugin version we are using, I'll report that later on.
The new version introduces a new attribute 'textAdjust' in the textField tag: '<textField textAdjust="StretchHeight" isBlankWhenNull="true"> as in this example.
Opening this file in 6.9 results in errors you can fix...
HTH
Joost