Colorer causes infinite loops in eclipse

I've used Colorer for a while now and it's great.

However using the latest version and eclipse 3.1RC1 I
get the following error in the logs and the colorer
editor screens don't update. Minimising the screen and
then maximising it again appears to help temporarily.
As the rest of eclipse works fine I'm assuming that
this is a Colorer bug.

Log contains:

!ENTRY org.eclipse.ui 4 4 2005-06-08 14:18:05.170
!MESSAGE Unhandled event loop exception

!ENTRY org.eclipse.ui 4 0 2005-06-08 14:18:05.175
!MESSAGE Failed to execute runnable
(org.eclipse.jface.text.Assert$AssertionFailedException:
Assertion failed: )
!STACK 0
org.eclipse.swt.SWTException: Failed to execute
runnable
(org.eclipse.jface.text.Assert$AssertionFailedException:
Assertion failed: )
at org.eclipse.swt.SWT.error(SWT.java:2940)
at org.eclipse.swt.SWT.error(SWT.java:2863)
at
org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:121)
at
org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:2747)
at
org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2478)
at
org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1601)
at
org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1565)
at
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:315)
at
org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:143)
at
org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:103)
at
org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:230)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:371)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:160)
at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at
org.eclipse.core.launcher.Main.invokeFramework(Main.java:330)
at
org.eclipse.core.launcher.Main.basicRun(Main.java:274)
at
org.eclipse.core.launcher.Main.run(Main.java:977)
at
org.eclipse.core.launcher.Main.main(Main.java:952)
Caused by:
org.eclipse.jface.text.Assert$AssertionFailedException:
Assertion failed:
at
org.eclipse.jface.text.Assert.isTrue(Assert.java:189)
at
org.eclipse.jface.text.Assert.isTrue(Assert.java:174)
at
org.eclipse.jface.text.source.LineNumberRulerColumn.getBaselineBias(LineNumberRulerColumn.java:812)
at
org.eclipse.jface.text.source.LineNumberRulerColumn.doPaint(LineNumberRulerColumn.java:690)
at
org.eclipse.jface.text.source.LineNumberRulerColumn.doubleBufferPaint(LineNumberRulerColumn.java:621)
at
org.eclipse.jface.text.source.LineNumberRulerColumn.redraw(LineNumberRulerColumn.java:863)
at
org.eclipse.jface.text.source.LineNumberRulerColumn$1.run(LineNumberRulerColumn.java:362)
at
org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at
org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:118)
... 18 more