Hi,
In regards to trend lines, the lines will not always match up to the exact same points when changing time frames.
This is more related to the data than the charting software. By default, MotiveWave only loads enough data to properly display the chart and studies on that chart. MotiveWave will attempt to estimate where the starting point is using the trading hours. However, this is an estimate and may not match up exactly. You can change this behavior in the Preferences Dialog (Configure -> Preferences). Click on "Chart" then on "Options".
The option you want to look at is "Resolve Trend Lines". However, I would recommend that you leave this turned off as it can cause a lot of data to be loaded from your broker / feed, resulting in significant slow downs on lower time frames.