Avid today released Sibelius 2018.5, a small maintenance release on the heels of the larger 2018.4 release and 2018.4.1 update from last month.
According to senior project manager Sam Butler, “We’ve fixed an issue in Sibelius where running some plug-ins would cause a memory leak that slowed Sibelius down until you restarted it.”
This most notably affected the Dolet MusicXML export plug-in (as described in this forum post), but surfaced in other plug-ins as well, and only on Windows, not on Mac.
The Sibelius 2018.5 update is free for all Sibelius Ultimate and Sibelius users with active subscriptions and upgrade plans. The updated installers are available from Avid Application Manager or through users’ Avid Accounts.