I work with gretl v 2023a (32bit) on Win7. So far I had no problem saving and retrieving sessions. Recently, after deleting renaming  and saving nls models in sessions. I can not retrieve them.  Most of the time I can retrieve up to 3 nls models, while I can retrieve aw many as a have OLS models.

I reinstalled the gretl deleting everything but still have the same problem.

Thanks in advance 

This sounds like it might be related to a problem with decimal commas and session files that was recently fixed (after 2023a). Are you working with a decimal comma or decimal point?

You might try out a recent snapshot (http://sourceforge.net/projects/gretl/files/snapshots/gretl_install-32.exe/download) to see if this solves your problem.

cheers

sven