Happened when I switched back to Forte from another application. I don't know 
what was on the clipboard. Here's the log entry:

[IDE-Exec] Executing:
0 .= E:\IDES\Forte\3.0\bin\fastjavac\fastjavac.exe
1 .= -g
2 .= -jdk
3 .= e:\JDK13~1.1\jre\..
4 .= -classpath
5 .= E:\Users\Tom\system;E:\IDES\Forte\3.0\system;E:\IDES\Forte\3.0
\beans\TimerBean.jar;E:\Users\Tom\sampledir;I:\Source\SplitHierarchy\util;I:\Sou
rce\SplitHierarchy\tdb;E:\Users\Tom\modules\ext\persistence-
rt.jar;E:\IDES\Forte\3.0\modules\ext\AbsoluteLayout.jar;E:\IDES\Forte\3.0
\modules\ext\sql.jar;E:\IDES\Forte\3.0\modules\ext\rowset.jar;E:\IDES\Forte\3.0
\lib\ext\jdbc20x.zip;E:\IDES\Forte\3.0\lib\ext\xerces.jar;E:\IDES\Forte\3.0
\lib\ext\parser.jar;E:\Users\Tom\modules\ext\jasper.jar;E:\IDES\Forte\3.0
\lib\ext\servlet.jar;E:\IDES\Forte\3.0
\modules\ext\webserver.jar;E:\Users\Tom\lib\ext\j2ee.jar;E:\Users\Tom\modules\xm
lservices.jar;
6 .= 
I:\Source\SplitHierarchy\tdb\com\spenkana\tdb\cluster\storage\RDBCluster.java

*********** Exception occurred ************
Wed Aug 29 13:47:44 CDT 2001: java.lang.IllegalStateException: cannot open 
system clipboard
java.lang.IllegalStateException: cannot open system clipboard
	at sun.awt.windows.WClipboard.openClipboard(Native Method)
	at sun.awt.windows.FullyRenderedTransferable.<init>(WClipboard.java:158)
	at sun.awt.windows.WClipboard.getContents(WClipboard.java:86)
	at org.netbeans.core.CoronaClipboard.refreshClipboard
(CoronaClipboard.java:119)
	at org.netbeans.core.CoronaClipboard$1.actionPerformed
(CoronaClipboard.java:83)
	at javax.swing.Timer.fireActionPerformed(Timer.java:150)
	at javax.swing.Timer$DoPostEvent.run(Timer.java:108)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:154)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:337)
[catch] at java.awt.EventDispatchThread.pumpOneEventForHierarchy
(EventDispatchThread.java:131)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy
(EventDispatchThread.java:98)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)