Lazarus Crash in IDE Docking Mode

Description:

Today I tried the IDE Docking Layout:

Lazarus v2 RC1 32bit on Win10 64bit.
(other systems (I can't test) probably have the same problem)
IDE docking-layout (anchordockingdsgn.lpk installed)
(IDE nondocking (floating) layout doesn't cause the crash)
IDE two-column docking-layout:
Left column: Object inspector
Right column: Source editor at top and Pagecontrol at bottom.
The Pagecontrol contains as tabsheets:
Messages, Search Results and all (9) Debug Windows.
Code Explorer is not visible (has been closed with its red button).
The loaded project is a new application (empty form)
(This might be irrelevant.)
When I click "View / Code Explorer"
( only Code Explorer is causing the crash, other IDE Windows are OK).
then the IDE is jumping/flickering wild on screen, many times per second.
After some seconds Lazarus becomes invisible, except for its Pagecontrol,
and a modal message appears: "Access violation".
Clicking on this message closes the IDE after another few seconds.

In summary, Code Explorer can't be used together with this IDE Layout.