One way to help solve your SFW problem is try a Reset. Open a small image in SFW and press the Alt key. The Cancel button will change to Reset. Click on that and see if it fixes the problem.
I am totally flummoxed at why the alternative does not work for you, but my intention is to help, not debate.
For the sake of getting work done, there is also an image processor that will allow a batch conversion of a folder of psd files to jpegs to a separate folder if SFW fails.