A part of the problem of "Bug 50783 - Can't create database or access table in Base" still is Reproducible with "LibreOffice 3.6.0beta1 German UI/Locale [Build-ID: 1f1cdd8] on German WIN7 Home Premium (64bit). I can open database document from Menu 'file', but connection to table fails with message 'The connection to the data source <SourceName> could not be established. The file <FileName> could not be loaded. The Database is based to a spreadsheet. Bibliography database works fine. I will contribute a test kit ASAP
Forgot to mention: JRE 1.6.0_31 is active (due to dialog)
Not reproducible after a PC reboot. I will do some further tests, but might have been a onetime effect.
Pretty sure a DUP of "Bug 50911 - FILEOPEN impossible for any existing.ods" *** This bug has been marked as a duplicate of bug 50911 ***