User gd_on reported in the forum an assert when clicking on Settings -> Environment.
The issue is located in the new loghacker plugin: a wxFlexGridSizer is created with two rows and two columns, but later six elements are added to it.
There is also an error in the post build steps of loghacker_wx31.cbp: the output directory must be devel31, not devel.
The attached patch fixes both issues.
Applied in SVN. Thank you!