No, I don't think that has made any effect! I have booked tatkaal tickets, lets say 15 number of times, in the light-weight version and of that have failed 8-9 times.
What I've experienced is, the site makes you proceed through the names and payment section easily but the section after payment is done is where all the damage is done.
The sites keeps buffering, the payment gets debited from the account and the ticket does't get issued.
I...
more... think this section is where CRIS should come up with some innovative and effective algorithm or at least Iridium should be consulted for that matter!