PlasmaSum -c does nothing by itself

[diafero]

What steps will reproduce the problem?

1. plasmasum -c newsumfile.sum
2. plasmasum -c existingsumfile.sum

What is the expected output? What do you see instead?

1. plasmasum -c newsumfile.sum should create a new, empty file. It does not, and the only output is:
   newsumfile.sum:
2. plasmasum -c existingsumfile.sum should empty the already existing sum file. It does not, and the only output is:
   exisitingsumfile:

There is no error message.

What version of the product are you using? On what operating system?
Last Windows build for 64 bits. On Windows 7 64 bits.

Please provide any additional information below.
libHPlasma and Uru are installed on drive I:, and UAC is turned off.

(from https://code.google.com/p/libhsplasma/issues/detail?id=77)