After Jenkins version 1.607 jobs that run on the same SVN directory/repository and are throttled with using Throttle Concurrent Builds Plugin (Multi-Project Throttle Category is setup for these jobs, all are part of the same throttle category) are being executed at the same time and not queued correctly.

This leads to SVN locks (one project detects the lock, wants to clean and re-checkout SVN repository, others fail etc.).

This started happening with 1.607 and is still present in 1.609. Reverting back to 1.606 fixes the problem.

Not sure, if an update to the Throttle Concurrent Builds Plugin is needed or if this is a core issue.