[ BUILD # : 6.8, sorry ]
[ JDK VERSION : 1.6.* ]

open 2 java files
- open tools diff on those
- use some of the "Insert" arrows
- go to tab of one of those files (automatically saves the changes)
- make some changes manually and save
- go back to diff tab
--> can't scroll with mouse wheel until it click in the pane, resulting in
problems from bug 182323

- sometimes I too see this problem after initially opening a new diff tab.
my feeling is, the latter depends on heavy memory/CPU usage, e.g. many diff
views from long java files (PC is kind of unresponsive in those cases because
of many opened programs at one time, so swapping occurs and GC from NetBeans
too is working often)