We released a new version of the Activiti Designer Eclipse plugin (5.14.1). This release is a bug fix version, which solves the issues with form properties, task listeners and element id changes. The release is available on the following URLs (as always):
http://www.activiti.org/designer/archived/activiti-designer-5.14.1.zip (archived site)
http://www.activiti.org/designer/update (update site)
Note that the 5.14.1 release also includes improvements to the BPMN DI label positioning information. This however has a side-effect that diagrams already including labels could need some label repositioning. But the label positioning should now be compliant with the BPMN specification.
Have a good weekend!