One thing which could cause the problem are missing image files.
You need a complete set like in test-png, i.e., you also need the "períod.png", "space.png" etc. files as well.
For a start you could try copying these files from the test-png set and see if this solves your issues.

To get further output of what is going wrong you can launch the status menu as follows (as root):
Note: you need to terminate it with CTRL-C if started this way.
Also, to get your clock "fixed" afterwards run (as root):