Jb,
on a Windows XP large network
When trying to open a folder for the first time I was greeted with a "Paramiter is incorrect" screen and then the Navigator window in PM went blank.
Now even when opening 4.5.1 the "Parameter is incorrect" screen appears before choosing a folder.
PM 4.5 was Removed before 4.5.1 was installed.
Is there anything special about the path names on the server, like extreme path length/depth, or non-ascii characters in the pathnames themselves?
The reason you are getting the error now when you launch is the Navigator is restoring the state of the tree to what it was when you last used it. There is a file named Navigator.state at the following location that can be removed:
<windows drive>:\Documents and Settings\<your user name>\Application Data\Camera Bits, Inc\Photo Mechanic
Quit PM, delete the Navigator.state file and the next time when you start up, you will get the default expanded tree.
I'll see if I can reproduce the problem, but knowing the names of each level of the path you were working through would be really helpful.
Thanks,
-Kirk