Well, I just did something very very stupid. I accidentally made a change in a script triggered (via "File Option") on a file opening, The really stupid change I made causes the opening window to immediately close, thereby closing the whole file. So, now the database closes automatically upon opening! And this was a nearly (>90% done) solution that I don't have a recent backup of.
Is there any way to circumvent or disable the particular script or the File Option setting that triggers it on opening? Or any other work around?