Hi.

Clear AbanteCart cache and check again. Also check for errors inside AbanteCart error log.
Additionally recheck what Brands added to your block

Hello.

Please separate questions to one topic for each 

Hi.

Did you mean CSS hover zoom effect? You can modify your template CSS http://www.corelangs.com/css/box/zoom.html

Hello.

I see it happen in 1.2.7 but I don't think this is a problem. The main seo key in your urls is for product
assistech.com/store/fc1204
but for better search engine parsing this url can contain category seo key like assistech.com/store/vision/fc1204
so even if category moved/renamed/removed your product is accessible for customers and search engines, is it problem?

Hello.

Make sure your have latest AbanteCart version. Also your should note that your site should switch to HTTPS only where sensitive data can be sent: login page, checkout pages. If your want to set your site to HTTPS only please set store url setting as https too

Hello.
I did not see space problem in my Chrome browser. Make sure you use latest chrome version and browser addons do not insert anything to the site

Hi.
Try this tip http://forum.abantecart.com/index.php/topic,547.msg1688.html#msg1688

Most of the major email providers use some kind of scoring mechanism to figure out how likely it is that an email is spam. If the email exceeds a certain threshold, it's filtered to the spam folder. The threshold changes for every receiving server, and some are configurable by the recipients.

Even your IP address/domain is important - some spam filters will flag an email if anyone with the same IP/domain has sent spam in the past.