RCP: 0.7.8, start.groovy execution thread
The start.groovy execution is done in a Job which is called after the TXM starting Job is done.
Solution
It (the script or the script job) should be called during the TXM starting job.
The ExecuteGroovyScript command job must be managed by TXM starting Job.
(from redmine: issue id 2245, created on 2017/09/05 by Matthieu Decorde)