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Ok, I've got it:
in the SQLDev-installation-zip-file there is something missing (?):
the directory "zi" and the file "tzmappings" in C:\SQLDeveloper\jdk\jre\lib
I copied the folder and the file from the old 3.0-Installation and voila now i see numbers in the numbercolumns :-)
I don't know why this is missing. Have I done a mistake while downloading and unzipping? I don't know :-(
I usually download SQL Developer without the JDK, so I had to download sqldeveloper-3.1.07.42.zip to verify. Yes, in fact tzmappings and the zi are there, both when inspecting the archive and after performing unzip.
Something must have gone wrong with your download/unzip. Looking at various Java JDKs I have installed, or the Java that comes with Oracle 184.108.40.206, all have tzmappings and the zi directory. The file timestamps and the number of files in the zi directory may vary, but it should always be there in some form.
SQL Developer Team