I tried the getting started sample (cs) and tried the control in a vb.net 2005 sample (only control with same references as in cs)
Same, not all pdf's i opened have in vb have mirrored upside down text - same pdf in cs works, also the find don't works - maybe my fault.
I attach the pdf and the screenshots.
Attachment:
pdfviewer_vb_9ca07c42.7z