To reproduce:
1. Create JSP & Servlets/Tag Library from
templates (File/New)
2. Select 'Add Tag' dialog from context menu 
3. Push OK and select created tag 
4. Push 'Add Tag Attribute' from context menu
===============================================
 Tested Window title : Add New Tag Attribute
===============================================
 No Accessible description :
   Class: org.netbeans.core.NbDialog {  Add New
Tag Attribute |  }
    
5. Close the dialog and push 'Add Scripting
Variable' from context menu
===============================================
 Tested Window title :  Add New Tag Scripting
Variable
===============================================
 No Accessible description :
   Class: org.netbeans.core.NbDialog {  Add New
Tag Scripting Variable |  } 

The same problem is for the 'Tag Attribute
Customizer' and 'Tag Scripting 
Variable Customizer' dialogs.

Product Version= Sun Java Studio Enterprise 6
2004Q1 (Build 040215)
IDE Versioning = IDE/1 spec=3.42.2.0.1 impl=040215
Operating System = SunOS version 5.8 running
on sparc
Java; VM; Vendor = 1.4.2_0