J2SE Version (please include all output from java -version flag):
java version "1.6.0_26"

Does this problem occur on J2SE 1.4.x, 1.5 or 6?  Yes / No (pick one)
No, worked fine with 6u25.


Operating System Configuration Information (be specific):
Windows 7 32 bit. Windows XP works ok


Hardware Configuration Information (be specific):
Tested on i386

Bug Description:
 the latest official JDK/JRE (1.6.0_26) has broken something really basic with jni. 
 It shows at least on Windows 7 32 bit. Windows XP works ok.

 What happens for end users is that the "Add images" button inside our desktop
 software jAlbum (http://jalbum.net/software) 
 no longer works. Nothing happens. This is almost the most important button in the
 whole program, 
so for us, this bug is VERY severe. I've traced it down to the
 following JNI call:

  public native byte[][] getFiles2(); 

That call belongs to net.tomahawk.XFileDialog, a Java JNI wrapper for Windows native
file dialog. 
We use this wrapper so our users can select multiple images and see
thumbnails as they do multiple 
image selection from their file system. The Swing
alternative is too outdated and doesn't blend 
with the Windows 7 experience, so 
we're forced to use this workaround. Now it doesn't work anymore 
and we get no 
error at all from this call. When it works, it should pop up the Windows file 
dialog, 
but now nothing happens. I can add that the maker of this wrapper has
abandoned it so we can't 
get any support from him.

What jni related changes have been introduced in 1.6.0_26 that may cause this? 
It worked fine on earlier versions.

Appreciate a quick response to this, cause at the moment, this bug hurts our
business a lot!


Simply download jAlbum(http://jalbum.net/software) on Windows 7 and press the "Add" button to confirm the problem.
Attached x.filedialog.jar and .dll test library files.

Here is also a code snippet for how interact with this API, 
that should trigger the problem:

import net.tomahawk.XFileDialog;
...
XFileDialog dlg=new XFileDialog((Frame)parent);
dlg.setThumbnail(true); 
dlg.setTitle("Add images");
dlg.setDirectory(currentDir.getAbsolutePath());
String[] filenames = dlg.getFiles(); // Returns without opening dialog. Should normally open a modal dialog and wait for user response
Closed as Duplicate of 7056092. Updated the RE / RM to that of 7056092.