The biggest problem with v115 was the save/load feature. Therefore, all of my stand-alone games using that version did not allow the player to do a save/load. This was not very well received as you can imagine.
I don't know what is causing your problems with v116. But with this version I am now allowing save/loads.
I have to admit I was having difficulties with v116 at first; but, I then discovered that going back and forth between versions and/or mods was driving FPSC crazy. When I finally decided to delete everything, including any references to FPSC in the registry, re-installing FPSC v1.0, then updating to v116 and sticking with it. I no longer had any problems. I already had pretty much of RPG Mod finished and then stuck with that. Ever since I have had no problems. Of course, doing any of this has no guarantees. It could also be a problem with computer specs but I really don't think that is the case. What I really suspect is the registry. It gets bloated by going back and forth and re-installing without clearing up the registry. That can make any program go nuts.