I had just installed Plogger beta 3.0 in a sub-directory on my server and found that the picture enlargement through Slideshow or gallery view is not working. It goes to the error page every time. After spending hours looking into it, I finally found the solution. Am not sure if this is the ideal solution but it worked for me. I saw many people here looking for the same problem but no one cares to answer. I even saw some posts where people say "We solved it" but they didn't share the solution. I wish if someone had already shared the solution so many precious hours I would have saved. Anyways, here is the solution and hope it will save their time & energy:
In file "plog-functions.php" at line 1966, please replace this text:
You are correct, Manav, and myself and others have shared that same answer to many people's questions (here, here, and here to name a few). I'm sorry you didn't find what you were looking for right away. However, if you would have asked, I (if not someone else) could have pointed you in the right direction.