I'm not sure what triggers it, but once or twice a day, I get an exception popup
with "NoSuchElementException". 

From that point on, the IDE becomes unusable - anything Java-related I try to do
(code completion, go to file, etc. etc.) just aborts with NoSuchElement exception.

The only workaround I have found is to save my work and restart the IDE.

This is on OSX using sources up to date as of 11/27.

java.util.NoSuchElementException
	at java.util.AbstractList$Itr.next(AbstractList.java:427)
	at org.netbeans.modules.timers.InstanceWatcher.contains(InstanceWatcher.java:61)
	at org.netbeans.modules.timers.InstanceWatcher.add(InstanceWatcher.java:55)
	at
org.netbeans.modules.timers.TimesCollectorPeer$ObjectCountDescripton.add(TimesCollectorPeer.java:187)
	at
org.netbeans.modules.timers.TimesCollectorPeer$ObjectCountDescripton.access$000(TimesCollectorPeer.java:166)
	at
org.netbeans.modules.timers.TimesCollectorPeer.reportReference(TimesCollectorPeer.java:82)
	at org.netbeans.api.timers.TimesCollector.reportReference(TimesCollector.java:45)
	at org.netbeans.api.java.source.JavaSource.createCurrentInfo(JavaSource.java:1349)
	at org.netbeans.api.java.source.JavaSource.access$2300(JavaSource.java:117)
	at org.netbeans.api.java.source.JavaSource$CompilationJob.run(JavaSource.java:1112)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:417)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:269)
	at java.util.concurrent.FutureTask.run(FutureTask.java:123)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
[catch] at java.lang.Thread.run(Thread.java:613)