Hi Finema, for lost icons with CustomUI, that's because installing CustomUI writes a MoI v3 version of CommandBar.htm in place of the V4 one which is slightly different. So you can't install it by copying the CommandBar.htm directly like you did with v3, either you've got to splice the extra stuff into the new CommandBar.htm or wait for a v4 version of CustomUI.

In general since the UI is slightly different from v3 you can't just copy entire v3 customized UI files into v4, you've got to merge changes in with the new v4 structure.

- Michael