can not save renamed Materials

I am running BeamNG.Drive on a Ubuntu 14.04 Os with Steam and Wine. It runs stable with a suitable performance on my PC
Its an Quadcore 3GHZ PC with 8 GB RAM and Nvidia Quadro FX4600(768mb) graphics. I am greatly impressed about this Game.

I ve found something, thats a little bug maybe, but i am not sure.

When i work on materials in the Material-Editor, i can rename the Material. But when i try to save a renamed Material, nothing happens.
By improving the materials library, the Material has still the old name, not the new renamed one.

Perhaps you can give me a hint, if its my fault. Except one thing - I will not install a Microsoft OS just to be able to run one game, therefor i like my PCs to much.

Greets HAG

Have seen lately its the false section to post this here, maybe an Admin can move it to Bugreport?