Upgrade from X6 to 2019 has reduced the quality of export for web

Hello, not sure if this is the right forum.  I've just upgraded from X6 to 2019 and the anti-aliasing on Export for Web (to 24-bit png) seems to have become much more noticeable, with a reduction in quality of the output image.  I'm exporting a vector from CorelDraw with some lettering - the output image has to be quite small because of the constraints of the web product I'm using - and it's really blurry compared to the output from X6.  Has anyone else experienced the same / found a workaround to improve this?  I don't seem to be getting any sense out of Corel support.

Many thanks.