Chroma Subsampling choice in jpg optomizer Pspx5

[RoseW]

The default 'None' appears to have changed in PpsV5
A resized image saved as an optomized jpg now has a blurred, non sharp result.

There is a post in the bugs and fixes section of this forum by Robolousky on Nov.16
'Chroma Subsampling works in exactly the opposite way -
None results in a blurred image
Maximum 4x4 2x2 2x2 gives a pin sharp result'

I jumped from vX2 to vX4 in Sept and I didn't notice this result in v4 but I notice it in V5 installed in Nov.
Previously a resized jpg in Psp was of fine quality and a little better than the jpg exported straight from Lightroom
I returned to X4 for important resized saved jpgs and perhaps I need to reinstall X2
OR is it as simple as setting the Chroma to the last choice in the drop down list?

The irony is that it has been the exceptional saving a resized jpg that has been my main reason for having Psp.

Rose