I'm seeing some unwanted visual artifacts when using Simple Image Gallery Pro Plugin v2.5.7:

1. When you install the Layout template for image galleries in the  Elegant position (Popup engine for image galleries in the Pretty Photo situation or Slimbox2), unexpected small squares are displayed at the top right of the thumbnails.

2. When you hover the mouse over the frame of a thumbnail image, unexpected popup text (html source code) is displayed.

You may find an example at remdesign.16mb.com/#!prettyPhoto.

I've made an illustration of these artifacts in the first image on the second row (annotated in red).

Could you advise of a fix or a work around?

1. This is a css conflict.
2. Could you be more specific?

Please look an example remdesign.16mb.com/#!prettyPhoto.
I only used a STANDART template BEEZ2 which is part of Joomla 2.5 and pictures from there.

The css conflict is from layout.css element styling:
#main ul {
    list-style-position: outside;
    list-style-type: square;
}

To solve this just go to plugins/content/jw_sigpro/jw_sigpro/tmpl/Elegant/css/template.css and change this:

ul.sigProElegant {
    list-style: none outside none;
}
to this:

ul.sigProElegant {
    list-style: none outside none !important;
}

Thanks.

In recommendation is repeated twice the same information:

ul.sigProElegant {
    list-style: none outside none !important;
}
to this:

ul.sigProElegant {
    list-style: none outside none !important;
}
But I replaced "list-style:none; clear:both; overflow:hidden;"  on the string  list-style: none outside none !important;

At the same time is really no longer display small squares.

But still remains the second bug:
2. When you hover the mouse over the frame of a thumbnail image, unexpected popup text (html source code) is displayed.

1. Sorry, I have corrected the above!
2.Check your settings in SIG PRO plugin that are related with captions.

Even if the title is off html code is displayed!

Settings:
Default caption (label) handling: No captions
Caption word limit  ___ (empty)

Also see the example on my site, please.

Could you be more specific please?
What has been left to solve?

If you hover the mouse on the frame around the picture appears HTML text, which should not be! This text is superfluous. It should not appear.
See also attachment.

Could you pm me access to your backend please?