davidallen23 on "[Plugin: WP Photo Album Plus] Slideshow/album display size"

Hi
I am having display problems with slideshows not displaying at the correct width:
http://www.gamlingayphotos.co.uk/latest-additions/
Using the code: [wppa type="slide" size="350" align="centre"][/wppa]
the slideshow used to display full width of the page, but now it's narrower.
I find that I now need to change the code to [...size="700"] to correct it.
The problem shows on all major browsers.
Also on several pages albums which are set to: 'Max number of thumbnails per page = 12' (4 x 3) don't always display correctly - sometimes it shows as 2 x 6.
Please advise

https://wordpress.org/plugins/wp-photo-album-plus/