this is only a small issue, however could save (afflicted) users quite some time:
On my three monitor system (using 2 nVidia Quadro graphics cards), the Thumbnails pane, if detached and moved to monitor #3 (for technical reasons the leftmost monitor) doesn't remember its size and location after restarting PDF-XChange Viewer
(the same happens after only closing and re-opening a PDF file):
1.) before
(Thumbnails pane on the leftmost monitor):
2.) after restarting PDF-XChange Viewer
(Thumbnails pane snapped back to the middle monitor):
The other panes (Find and Bookmarks) on the rightmost monitor remember size and position perfectly.
Thank you already for having a look into this,
Keep up the great work,
Regards David.P
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PS: the leftmost monitor seems to have negative X-coordinates (-1280 through -1, looked up via a "window spy" tool). Maybe PDF-XChange Viewer can't handle these and therefore doesn't save the Thumbnails pane's location?