Srirangaraj N C,
Glad to hear you have found the cause of your issues.
Regarding theme.
We have updated the theme Arpil 9th.
Most likely your theme was not up to date.
Just delete "Macabre" theme via FTP or control panel. Download fresh one from store and add it via admin panel.
>>But, do I have to keep on changing themes everytime there is an update on oxwall...??
Not really.
In 1.5 we did a lot of changes ( like top right colose) which effected the way all themes work. That is why you have to make sure that your theme is compatible with this version of Oxwall. But minor updates like 1.5.1, 1.5.2, 1.5.3 don't contain any huge changes and you don't need to update your theme if you update to those versions from 1.5.0.
Basically you need to update your theme only for major updates of Oxwall's core.