Customizing Favourite Toolbars Does a Dance

[BGM]

Using version 629...

My configuration uses three levels of toolbars. I mean that I have all my toolbars arranged using 32pixel icons, and there are three rows. I am using a 1920 wide monitor, and FreeCommander is maximized.

When I customize them, the toolbars seem to keep their places okay, but when I click the OK (accept) button, all of the toolbars dissappear, the folder panels expand to fill the space that was just mad, then the toolbars get put back one by one until they take up their original area again. That's what I meant by "does a dance" in the title.

It is actually visually shocking to watch it, even though it only takes a few seconds - but it makes you think something is going wrong.

[BGM]

This is the case (629) also if I change the font settings.

If I just open the settings panel and click okay to close it, then I can see the colours getting redrawn and there is some flickering, but no toolbar dancing.

Settings:
many toolbars
show menu as toolbar: no

If I open a fresh freecommander (629) and set these two settings, I can see the dance even with just the default toolbar and no custom ones.

If I open the settings panel and cancel out of it, then there is no dance nor flickering.
However, even in the fresh freecommander (new ini) using this commandline
/N /NewIni=FreeCommanderTest.ini /NoPlugins /Lng=English
it takes close to 8 seconds for the panel to open (I've got 16 gb of ram and a quad-core).