Seen with 
Product Version: NetBeans IDE Dev (Build 200707250000) Java: 1.6.0_01; Java HotSpot(TM) Client VM 1.6.0_01-b06 System:
Windows XP version 5.1 running on x86; Cp1252; en_US (nb) Userdir: C:\Documents and Settings\lautz\.netbeans\dev

I installed the a11y plugin Version 2.4 available here: http://a11y.netbeans.org/nbms/v2.4/org-netbeans-modules-a11y.nbm

1. Open a WSDL document in the WSDL editor, WSDL view.
2. Click the a11y icon (wheelchair icon).
3. In the Test Results tab, specify a file for the output.
4. In the UI Accessibility Tester dialog, click Run Test.
5. Select the WSDL view frame, and click Ctrl-F11.

=> The UI Accessiblity Tester dialog contains a message "Error: test canceled."
=> The file (and associated property file) specified in step 3 are empty.
=> The NetBeans message.log file contains the following NullPointerException stack trace:
java.lang.NullPointerException
	at org.netbeans.a11y.TestSettings.getCorrectedWindowTitle(TestSettings.java:98)
	at org.netbeans.a11y.TestSettingsLogger.getReport(TestSettingsLogger.java:44)
	at org.netbeans.a11y.AccessibilityTestRunner.writeResults(AccessibilityTestRunner.java:142)
	at org.netbeans.modules.a11y.AccessibilityTesterRunnable.runTest(AccessibilityTesterRunnable.java:144)
	at org.netbeans.modules.a11y.AccessibilityTesterRunnable.run(AccessibilityTesterRunnable.java:101)
	at java.lang.Thread.run(Thread.java:619)

Also true with the Partner View.