If you've got the latest version, then that appears to be a problem with your d2x.ini (located in the \config directory usually).
Remove the semicolon ( ; ) from the beginning of the line that says ;-fullscreen
Or, better yet,
rename your d2x.ini to d2x.ini.bak or something similar, or move it to another directory on your system
Download mine & put it in your \config directory
(See attachment, rename it from d2x.ini.txt to d2x.ini)
To rename it, open a cmd window (start - run, type cmd , press enter)
then, type in the letter of the drive where you saved my file followed by a colon, eg:
C:
then press Enter
then type
cd \games\d2x-xl
replacing \games\d2x-xl with your pathname to my file
then type
ren d2x.ini.txt d2x.ini
and press Enter
Hopefully, this will take care of several of your problems. To find out the differences between the two files, in a cmd prompt window, with both of the files (your renamed one, and mine) in the same directory, type in fc /L d2x.ini.bak d2x.ini
You can also specify pathnames if the files are in different directories, eg fc /L c:\games\d2x-xl\backup\d2x.ini c:\games\d2x-xl\config\d2x.ini
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