What happened to the “4:3 Aspect” button in the Liberty Paint environment?
In Liberty V7.0, this button was moved to the Configuration environment, in the “Defaults” popup (in the Canvas Configuration panel). Just select “601 NTSC” or “601 PAL”, then turn on “Aspect Correct Computer Monitor”. It has the same effect as the old “4:3 Aspect” button. Note that in Liberty V8.0, the “Defaults” button was renamed to “Advanced Settings”. See the V8.0 Release Notes for further details.