Thanks very much for the advice! I did the steps as you recommended but it still didn't work.
I then contacted the Help Desk and managed to have it sorted out.
If I may share, I realised that as I'm from Singapore, I will have to trade on the markets ending with '.s' (Eg. EURUSD.s). So I followed the steps given and wohoo finally got the undistorted charts back up.
These are the steps: Click on View on your MT4 platform and select 'Symbols > C-Forex-SG/C-Metals-SG/C-Indices-SG'. Click on the chart(s) required, then click Close. Go to Market Watch or Create a new chart on your MT4 platform to load the chart(s).
Hope this helps others as well in future.
Thanks once again!