First of all: Thank you both for responding. I was really in panic this morning; when this first happened to me, I thought, all my data was gone. But now, I assume, that somehow, "just" the settings are reset, as suggested by Reeza (spoiler for my "theory" on this issue). Sometimes, I, accidentally, double-double-click SAS.exe in order to open it. Then, the "first" SAS.exe would operate normally, the "second" SAS.exe would not have access to the settings, because the "first" SAS is using them. Then, I conveniently close the second SAS and everything works fine. But maybe, sometimes I double-double-click too fast - then, the settings are corrupted at all. What I would like to add, is the following: In addition, other settings are overwritten; e.g., I have it set in general, that, instead of variable-labels, I have variable-names displayed in tableview. This setting I adjust via this instruction, is also gone. So, Reeza's answer is exactly what I was looking for. Indeed, "it was blank", so I created an "autoexec.sas" with the txt.-editor and stored it in my "current folder" and it worked perfectly. To combine, I take the solution by Bruno and create a file with all librefs-statements. This is taken aside, as recommended by Reeza. The content of that very file is pasted into - the now existing - "autoexec.sas" in my "current folder". Such, if it happens again (which, as I hope, should not, for I know have an autoexec.sas, but, who knows), I have a back up. So, once again, thank you very much indeed. It is always a horror to see all the libraries vanished. Sinistrum
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