CandorZ

Looks like a pretty generic error. It has been described well here
You need to modify your code
$results = $wpdb->get_results( $wpdb->prepare("SELECT * FROM ".$wpdb->prefix."wpdeals_permissions WHERE user_id = $this->user_id AND order_key = '$this->order_key' AND deal_id = $item_id" ));
to
$results = $wpdb->get_results( $wpdb->prepare("SELECT * FROM ".$wpdb->prefix."wpdeals_permissions WHERE user_id = $this->user_id AND order_key = '$this->order_key' AND deal_id = $item_id",0));
or
$results = $wpdb->get_results( $wpdb->prepare("SELECT * FROM ".$wpdb->prefix."wpdeals_permissions WHERE user_id = %d AND order_key = %s AND deal_id = %d",$this->user_id,$this->order_key,$item_id));

Do take care of %d and %s while using the above one…

And do drop a link of your production site.

Any one having the problem can download the js files from:
Edited JS (ZIP)

I am also involved in active development of WPDeals (Part time, ofcourse)
so don’t hesitate to drop me a mail…

It’s something to do with the REGEX

if(/1\.(0|1|2)\.(0|1|2)/.test($.fn.jquery)||/^1.1/.test($.fn.jquery))

which is checking the version of JQuery

You are free to resolve it or comment out the

if(/1\.(0|1|2)\.(0|1|2)/.test($.fn.jquery)||/^1.1/.test($.fn.jquery)){alert('blockUI requires jQuery v1.2.3 or later!  You are using v'+$.fn.jquery);return;

in wpdeals_admin.js
and

if (/1\.(0|1|2)\.(0|1|2)/.test($.fn.jquery) || /^1.1/.test($.fn.jquery)) {
	alert('blockUI requires jQuery v1.2.3 or later!  You are using v' + $.fn.jquery);
	return;

in wpdeals_plugins.js

I have already informed the developer

MichaelOzb, you solution “Works Great”!
Could someone please also post how to include an image as a currency symbol?

If you know what you are doing then you may:

comment the if that checks the jQuery version using /*…*/
The following needs to be commented in:

wpdeals_plugins.js and wpdeals_admin.js

if (/1\.(0|1|2)\.(0|1|2)/.test($.fn.jquery) || /^1.1/.test($.fn.jquery)) {
	alert('blockUI requires jQuery v1.2.3 or later!  You are using v' + $.fn.jquery);
	return;
}