I have a similar issue. I didn't have the previous version so not sure if this is a new development.
I had the trial version; it worked fine for what I needed, but I got tired of the constant popup every time I closed the software, advertizing to buy the full version for $50.
So I did.
With the Pro version double clicking on a file in Windows Explorer opens in Truesizer. The first file. But after Truesizer is open, no additional file opens. At least with the Trial I got a window asking if I wanted to save the currently open file, and after i clicked no (or yes) the new file opened. With the Pro, nothing happens, so it's a step backward.
