I was opening the Welcome screen (Help > Welcome Screen) when I saw a small
redish circle on the lower right side of the NetBeans window. When I clicked on
it a window appeared telling me that an error had happened, asking me to report
it - which I do:

The stack trace of the exception is:

java.lang.NullPointerException
	at
org.netbeans.modules.welcome.content.ContentPanel.requestAttention(ContentPanel.java:327)
	at
org.netbeans.modules.welcome.ui.ArticlesAndNews.feedContentLoaded(ArticlesAndNews.java:97)
	at
org.netbeans.modules.welcome.content.RSSFeedReaderPanel.propertyChange(RSSFeedReaderPanel.java:95)
	at
java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:333)
	at
java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:341)
	at
java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:270)
	at java.awt.Component.firePropertyChange(Component.java:7159)
	at org.netbeans.modules.welcome.content.RSSFeed.setContent(RSSFeed.java:101)
	at org.netbeans.modules.welcome.content.RSSFeed$Reload$1.run(RSSFeed.java:208)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
[catch] at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
	at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

Note that the Welcome screen and its content seemed OK.

Sadly ;-) I wasn't able to reproduce the problem...

Additional note: it would be nice if it were possible to copy/paste the link to
the netbeans community page and the error message directly from the error window
that appear when NetBeans catches an error as the one above - would spare a bit
of typing and clicking...