Product Version: NetBeans IDE 6.0 (Build 200711261600)
Java: 1.6.0_05; Java HotSpot(TM) Client VM 10.0-b19
System: Windows XP version 5.1 running on x86; Cp1252; en_US (nb)
Userdir: C:\Documents and Settings\mac\.netbeans\6.0

I have all the latest updates from the update center.
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I wanted to change one of my Java platforms to a newer release, specifically Java 6.0 update 4 to Java 6.0 update 5.  I
don't use the default one for my production projects.  To control it, I create a separately named platform for each
major version of the JDK.

What I did was:
1) Ensure nothing was executing in the IDE
2) Close all open projects
3) Ensure all editor tabs were close
4) Go to Tools -> Java Platforms, and remove my platform (not the default one)
----- At this point, on the status bar, it started re-scanning one of my projects
5) Add the new platform, using the same name as the one previously removed
6) Re-Open my projet

Once it started scanning, it was scanning constantly (making my machine very sluggish) until well after 6 was complete.

It seems that if all projects project are closed, the scanner wouldn't have anything to scan.  I didn't think this was
on purpose, so I thought I would report it.

If it is just the case that it always remembers 1 project, it is probably not a big deal.  But if the scanner actively
scans all project that were ever open in a session, then that could be more of an issue.