Is it possible that the text has a format that may cause a viewing problem? What happens when you use Command-Z immediately after paste?
If there is a format issue, maybe the Paste Text Only command in the Edit menu will work?
Comand Z works, only if text is being replaced.
Pasting into the text field, with existing text selected removes the text and leaves the cursor at the begining. Command Z reverts to original.
Pasting into the middle of existing text has no effect.
Paste w/text only command works the same. No Paste.
I also tried setting the field to auto replace with format removed, no result.
At the OS Finder level, at the Edit menu, view the clipboard when copied from Punto.
I found that pasting unknown clipboard contents into a text.rtf file and converting it the plain text, then recopying it allowed FM to read/paste some weird stuff OK.
That's not a solution, just a way to verify that the clipboard is holding something that FM can't read correctly.
If so, can you contact Punto support to ask about their clipboard format, and what it retains?