Not sure if this is related to Win10 restrictions - I have a new install of LtSpice and I can't save any new schematic. I get a "Trouble writing schematic' pop up, and then an "Encountered an improper argument.' error message box. No apparent related faq's or Q&A threads or google related info that I can find as to what may be stopping the save process. Any thoughts?
Ok, it was Win10 not allowing me to save to the default LtSpice install directory. Saving to a shared directory elsewhere is fine.
I can't think of any advantage to save anything in the installation folders of LTspiceIV or LTspiceXVII.I recommend to always use an extra folder(s) for your designs.