I'm having a similar "new window where none was wanted" issue:
I do have the preference setting set for:
⌘-click to open links: In a new background tab
In OmniWeb 5.1.3, viewing a page like:
http://forums.fark.com/cgi/fark/comm...IDLink=2046211
in that page I ⌘-click on the MSNBC image to the left of the "obvious" image and the link opens in a new Tab.
With OmniWeb-5.5-sneaky-peek-7-v578, it indeed forces the open to a new window.
Have I missed a new configuration item?