The newly introduced Effect panel, see https://gerrit.libreoffice.org/c/core/+/103835, crashes the application when expanding the panel. Happens in PanelLayout::GetOptimalSize() where m_xContainer is nil.
*** Bug 137696 has been marked as a duplicate of this bug. ***
andreas kainz committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/core/commit/ec9b799b48b7e93809d4ccbb6b8b3ea1642f7a13 Resolves: tdf#137615 fix EffectPropertyPanel It will be available in 7.1.0. The patch should be included in the daily builds available at https://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: https://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.