PDF-XChange Editor, Version 7.0 (Build 327.1).
I was very excited to hear about the touch improvements you added last year, but was very disappointed with the eventual implementation. Since I got my Surface Pro, I sadly had to switch away from PDFX as my daily driver.
Here are the main issues I face,
1) Scrolling through the sidebar panes (such as Bookmarks) with one finger, will inadvertently move the items around, unless you use two fingers or the scrollbar.
2) The Search pane is not scrollable with any finger, unless you use the scrollbar.
3) Long pressing on the items in the sidebar panes (such as Bookmarks) for the context menu, inadvertently activates the first menu item under your finger, after you release it. Why don't they behave like the context menu of the Search pane, where the menu stays open after you release it without activating any command?
Hopefully these issues will be resolved soon, thanks in advance.