I have a website developed and working correctly in v12.0.9.30 Pro. with a number of horizontal thumbnail galleries on separate pages all with a showbox to display the enlarged images.

After conversion to v13.0.0.14, images no longer scale correctly to fit the showbox but are instead compressed horizontally and stretched vertically to the full showbox dimensions so that they are very substantially distorted in the case of landscape images. The attached jpeg shows a typical example, with the original landscape thumbnail just visible to the left of the showbox.

The behaviour appears identical with a new project started in v13.

I have re-exported/imported the original .iwzip with identical results.

I can't find any settings that might force this behaviour and it was working previously in v12, so it looks like a bug in the latest version. Please can you advise ASAP.

Many thanks.