PAULPTHCOM  The default value of items saved is 100 and you can change it to whatever number you want. The text in the description is very old.  
(Version 4.2.4)

PAULPTHCOM  It should do this by default, if not its a bug (though I've just double checked and it seems to work properly).  
(Version 4.2.3)

PAULPTHCOM  Correct, not with this version. The fact that it was bringing up other windows when you used a HotKey was a big issue with a lot of people, so 4.1.1 was changed to address that.  
(Version 4.1.1)

PAULPTHCOM  Steve please contact support@pth.com for help.  
(Version 4.0b3)

PAULPTHCOM  You can paste as plain text by either using the PlainText filter or by holding down Command while clicking.

There's no way to filter input by a given type (i.e. only text). Is there some reason for you wanting that?

Toggling when clicking on the menubar is a good idea, I've added it to the future feature list.  
(Version 4.0b3)

PAULPTHCOM  You might want to check that the Always Show Window checkbox isn't enabled for one of the Custom pasteboards. If its not that email pthpasteboard@pth.com.  
(Version 4.0b1)

PAULPTHCOM  Did you happen to type something in the Search Field on the window? That causes the window to filter out any text in the window that doesn't match the string, if that's the case just clear out anything in that field.

Otherwise just send an email to pthpasteboard@pth.com and I'm sure we can figure out the problem.  
(Version 4.0b1)