SpaceFM icon changed by itself

Hello:

Have been using plank with success. Good work! Unfortunately my SpaceFM icon was inexplicaby changed to a white square with a blue bar on top. There's also no text alongside. If Keep in Dock is checked SpaceFM opens OK.

I checked the .desktop file and found nothing strange when comparing with other applications that display correctly.
Tried to include the full path to the icon without luck.

Will appreciate help with this issue.