WORKDAY and NETWORKDAYS crash Calc

Is this a genuine problem or am I missing a setting?
I have a small spreadsheet that uses the WORKDAY() and NETWORKDAYS() functions. In LibO 4.4.3 (English), when I close Calc I get a Windows error message “LibreOffice has stopped working”. If I remove those functions, the error doesn’t happen.

I’ve reverted to 4.2.3.2 (from around the last time I was working on a similar file) and the problem goes away.

Windows 7 64-bit English.

Works for me on LO 4.4.1.2 Windows 8
Peter

4.4.1.2 doesn’t work for me - perhaps it’s a Windows version thing. I’ve also tried 4.3.0.1 and that does work.

Does not work for me on Ubuntu 14.04 Libreoffice Version: 4.4.6.3