Poor image quality with Picasa Uploader for Mac

The sheer convenience of being able to upload directly from iPhoto means that many of my photographs from 2009 have gone to Picasa web albums instead of this website. However during a recent upload I noticed that during the process the photographs were being overly sharpened which had the effect of creating ugly artefacts on buildings with intricate decoration (e.g. churches). The odd thing is that if you upload jpgs one at a time via the web interface, this did not happen.

Looking back to some photographs from earlier in the year you can see this else where. For example compare this photo of Rosie at the top of a cold and windy church tower to the Picasa version below.

Rosie at the top of the Rye Church tower.
Rosie at the top of the Rye Church tower.
Rye from the church tower (Picasa version)
Rye from the church tower (Picasa version)

Picasa was convenient but perhaps it is time to return to hosting my own photographs?