I haven't received any proper answer, please share the answer.
Thanks,
Aviad

Now we are aligned :-) thanks for taking the time trying to understand.
so... do you have an assumption?

by SIM I mean LFS Version 6G.
again, LFS uploads only if i delete cfg.txt

the SIM uploads with black screen and nothing happens except for the intro music. if i delete the cfg.txt file than the SIM will upload but will have the default configurations.

each time i try to upload the sim, i get black screen with the music and the mouse icon.
I solve this by deleting the cfg.txt file from the LFS folder.
I have 0.6G version.
I looked at difference of an old cfg.txt and a new cfg.txt and as its name implies this file is only basic game configurations... I'm baffled.

Aviad

I get black screen after unlock... the demp previous to unlock worked fine. after unlock the sim will also npt resopnd

the demo runs ok. trying to unlock brings a black screen as seen in previous post attachment. and from this point onward only black screen whenever i try to run LFS. i use task manager to kill it.
,Aviad

Hi,
the issue is that after submitting user and pssword in order to unlock game i get Black window with a small square at the top left corner
the Demo uploads successfully. both version 6F and 6G. it's only after i try to unlock the game will behave as written above. it than gives black window each try i try to run it.