Problems with loading to paypal + shipping address

-- HikaShop version -- : 2.4.0
-- Joomla version -- : 3.4.0
-- PHP version -- : 5.4.38
-- Browser(s) name and version -- : Safari 8.0.5(Mac), Chrome (Mac) 41.0.2272.118 (64-bit)
-- Error-message(debug-mod must be tuned on) -- : No error message, when we press 'next' on the final page of the Checkout, it just reloads with no messages on why it won't move forward.

(when I disabled the Paypal plugin, it does show a message saying 'please select a payment method' on that page... but when it is enabled, it shows nothing)

Hi, I'm new to Joomla and Hikashop with no coding background. I have been able to get my site to roughly work but the Checkout is driving me crazy, I just can't seem to get it to work right. We are on the verge of launching so I hope someone could lend me a hand.

1) I have activated the HikaShop Paypal payment plugin. I it working when I tested it using sandbox Paypal credentials once. But that was before I added products and moved the checkout items around. I have tried again with it connected to the same sandbox Paypal credentials, all it would do is reload the last checkout page with no warning message. I have debug mode enabled but in the debug file, it shows no data. I am not sure what else to try.

2) Also, we are having a lot of problems with the checkout either showing a checkbox to have the same billing and shipping address, or no checkbox but the system auto-populate the same info into the shipping address anyways. Since we can't force the system to leave the shipping address blank, I wanted to remove it completely. But the Front CSS is set to 'none' as oppose to 'default'. If I enable 'default' then I notice the template that we use starts to look funny. Is there any other (easy) way to either have a cleared shipping address fields or remove this section completely?

My settings in Paypal and Systems > Configurations > Checkout is attached in case if they are useful. I will continue to browse on here for a solution, any suggestions or advice would be much appreciated.

HI Jerome:

Thank you for your reply. I have emailed the template owner about this with your comment. Sadly they have yet to reply. I am still trying to find a way to get it working in the meantime. I have even tried to perform a transaction with the Protostar template instead of their template, but when I reached the final page of the Checkout, the result was the same and there wasn't any error messages to tell me why it isn't working neither.

I took a screenshot of the final checkout page too, but not much to see:

I now have the following settings in Joomla:

Debug System > Yes
Debug Language > No

Error Reporting > Maximum

With the Flative template (from Joomlavi) in use, no error message or anything different would show up. I changed the template back to Protostar, then I see at the bottom of the screen the Joomla Debug Console. I don't know if it is giving any useful information relating to this problem. Below is a screenshot of all the tabs that contain data:

Hi Jerome and Nicolas:

Just want to add a bit more insight into this issue. I had a programming (non-Joomla) friend to take a look at the site's checkout php files. Upon a quick scan, he believes that the problem may be caused by the $tax codes. I have checked as best as I can to ensure that that are no tax settings turned on (because we have no intention to collect any tax for any reason). He found the following posts relating to this issue and have tried all of the solutions offered, including adding a '@' to the code like this: @$tax->tax_amount;...but nothing is working.

I am not a coder so I have no idea how to understand or fix this issue, sadly, so your help is extremely appreciated! Is it possible that this is the issue that is preventing the checkout from connecting to Paypal...and also...how to fix it?

Here are the links with possible solutions that he found and tried but without any success in fixing the issue:
demo.hikashop.com/support/forum/checkout...lem-at-checkout.html
www.hikashop.com/forum/2-general-talk-ab...lass-tax-amount.html
www.hikashop.com/support/forum/content-c...of-main-product.html
www.hikashop.com/forum/2-general-talk-ab...lass-tax-amount.html
hikashop.com/forum/checkout/860753-check...ty-stdclass-tax.html
www.hikashop.com/forum/checkout/874552-problem-at-checkout.html
hikashop.com/forum/checkout/860753-check...ty-stdclass-tax.html
www.hikashop.com/support/documentation/5...nfig.html#main_taxes
forum.joomla.org/viewtopic.php?f=579&t=784031

Hi Jerome:

We tested some more and my programmer suggested that for me to turn off unused plug-ins, I guess one of them must be causing this tax issue... Anyhow, it worked. Now the checkout is going to Paypal. Yay, happy days!

I will keep testing and update you should I encounter more issues. Thank you guys!

Hi Jerome:

Unfortunately I didn't do the smart thing of testing the checkout by turning off each individual plug-in at the time (cause I didn't really think that this would work!). If I had to guess, it may have been the HikaShop Australia Post shipping plugin...only cause I faintly remember turning this on at some point but realise that it isn't useful for my case since we do not need to use Australia Post for shipping. I wonder if it somehow asks for some kind of tax information which our site does not provide and therefore created this loopy problem?

I could be totally off but that would be my guess. I'll keep better track of these things the next time!