KLM/KMZ file doesn't work

[FGJBA]

Hello everybody, I have the Plan G V3.1 version and I noticed that klm and kmz files' import doesn't work on my computer. The problem is that nothing appears on the screen after the importation of the file. It seems similar as this topic : http://www.tasoftware.co.uk/forum/index.php?topic=2351.0 nevertheless I have done the modifications on the KLM file and it doesn't work.

Thank you very much