On Windows 7 64 bit, some days when calc is started with an .ods file it seems to freeze. I found out that if I stop the process splwow64.exe, calc immediately continues to load the file and continue normally. The splwow64.exe process is restarted by windows. It doesn't always happen. Sometimes calc is starting normally and sometimes not. I have no clue why it doesn't always behave the same but stopping splwow64.exe always helps.
The later bug raised by the same reporter contains more information, so I am closing this one. *** This bug has been marked as a duplicate of bug 66674 ***