I recently completed a clean reinstall of 64-bit  Windows 10 1709 on a laptop.  As part of the process I updated gretl to the current snapshot. 

At the end of a session I am prompted  to save a record of commands issued which I wish to do.  When I try to do so I get boxes with the following messages

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I also used windows update to update a tablet computer to 32-bit Windows 10 1709.  After the update 32-bit gretl2017d appeared to run without the problem. I downloaded and installed the snapshot version yesterday.  The session record problem now appeared on the 32-bit tablet.  I uninstalled the snapshot version and reinstalled the 2107d version but now the problem is in the 2107d version.  

I have also uninstalled the 64-bit version (using the supplied uninstall program) and reinstalled the 64-bit 2107d version and still have the problem.

I should say that there is no obvious problem with  the  'C:\Users\frain\AppData\Roaming\gretl\' directory.  The file 'prntmp.NvmQJo' has only the archive attribute set.  Also I was able to copy the messages to a text file in the directory.  I have been unable to copy or open the   'prntmp.NvmQJo' and when I close gretl the file vanishes.  I presume that the file is a temporary file containing the instructions issued during the session.