Hi Usha,
First of all, let us inform you that we do understand that this back and forth is frustrating, and you do want to get on with the website development. We are doing our best to find the problem cause and help you here. There are some points that are in our power; some stuff is not.
At the moment, we are doing tests to find why this is happening, and the fact that you installed the X theme on ushamaharaj and it is not working is a good starting place. As the X theme works ok on Merakiveolution I realized this should not be a theme problem, I tried testing that and installed the Pro theme on Merakiveolution.
The result was interesting; Pro works with no problem with Merakiveolution. This rules out any theme code related issue. It is a setup issue on ushamaharaj.
I spent some time to find out what is the problem, but I could not. I also have no clue other than the one that my colleague mentioned, which is the XMLHttpRequest. I am not sure that is the problem cause or not, but that is the only clue I have.
As you mentioned that this is basically a start over, I suggest that you do the WordPress and theme installation from scratch on ushamaharaj. This will be the ultimate test to see if the setup is the problem cause or not.
As a side note, it took ages for me to upload the Pro theme and activate it despite my super fast internet. This is only an observation and does not prove any point, but shows that the server is too slow and indeed the hosting service provider can be a problem cause.
Thank you for your patience and your cooperation to get the hang of this problem