
If I try Oxygen 7.2 for Eclipse 3.1 under Eclipse 3.2 it works ok.
Here is a relevant excerpt of the Eclipse .log file:
eclipse.buildId=M20060629-1905
java.version=1.5.0_04
java.vendor=BEA Systems, Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=es_ES
Command-line arguments: -os win32 -ws win32 -arch x86 -data e:\Aplicaciones\IMA\Desarrollo\DPerezcar\webIma6.1-E3
!ENTRY org.eclipse.core.runtime 4 2 2006-07-14 15:18:44.560
!MESSAGE Plug-in "com.oxygenxml.editor" was unable to instantiate class "com.oxygenxml.editor.EditorPlugin".
!STACK 0
java.lang.NoSuchMethodException: <init>
.....