Thank you very much for your help and for your time !!
Michael, I use REX random settings usualy and select the Sparkling water theme. What makes another +20% wow effect in my configuration is that I enable the High contrast setting in my Samsung 2233BW.You can try any similar mode in your screen. My LCD is rather old with 20000:1 dynamic contrast.
Yes, I just found also this tweak and now P3D starts without crashing on startup!!! I just wanted to be sure the crash doesn't return before I could post again the results.
Also, I found these links in avsim forums :http://forum.avsim.net/topic/397834-enb-shade-crash-will-it-ever-stop/ and http://forum.avsim.net/topic/348502-enb-ctd-possible-fix/
where users UVW and mr340 proposed to copy the d3dx9_26.dll from Windows\system32 to the P3D/FSX folder. I did it, and also copied all the other d3dx9.XX.dll files into the P3D folder.
It now seems to start and work correctly!
The last 2 days I am searching for this in order to make it work without (?) crashing..It seems I have nailed down some actions that cause a crash.
I have taken down some notes in order to avoid crashes if this is possible. I haven't made a complete flight more than an hour long, so I may face the black screen problem I have seen reported by others.
I will keep you updated.
So, my observations for not getting crashes at the moment are the following:
1) Use [GLOBAL]\UseEffect=0 in the enbseries.ini file.
2) Copy all d3dx9_XX.dll files from C:\Windows\SysWOW64 to the main Prepar3D folder, where XX are numbers from 24 to 43. (I don't know whitch are actually necessairy but it doesn't cost anything, just ~58mb). These files can be obtained also from C:\Windows\System32, but a user named Jettix in the second link above, suggested that the System32 contains 64bit versions of the .dlls while the SysWOW64 contains 32bit versions and P3D-FSX are 32bit programs. I am not a programmer, so I have no idea what is correct here, but I copied the SysWOW64 dlls.
3) When P3D starts, I can use any menu in Window mode, except from 'Select Aircraft'. This menu opens but if I try to choose any airplane I get a CTD.(faulting module: uknown).
4) I can only use the 'Select Aircraft' menu when in Full Screen mode.
5) Some add-on aircrafts once opened in Full Screen mode will cause the sim to crash again, if I try to switch to Window mode. I have find a solution that seems to work witch is:
When you first start P3D, it opens in Window mode. If the window's left and right borders are not visible, (ie. the window is maximised), then double-click the window's header (upper boarder). This will de-maximize the window. Leave it as it is when you use Window mode and do not maximize it again while in window mode. I observed that in this configuration, I could switch from Window to Full Screen mode without getting a crash. In an amount of ~10 such experiments I got one crash while using this rule, but I didn't get a crash 9 out of 10.
However I will try not to switch to window mode more than once in a flight and use a laptop for accesing the internet while flying. The only drawback is if flying online, where a disconnection may happen. I will have to return to window mode.
6) Another weird observation.. When you have selected your aircraft and you are in VC, go to external view and from there switch to Window mode the first time after the aircraft selection. If you switch to window mode while in VC view, it will crash. At least that happens to me. Its really weird but it is true.
7) Once in Full screen mode, I use Shift+F12 to switch the tweak on and off, like reseting it, every time I switch from Window mode. (I don't know if its doing anything, but I do it).
I will continue to investigate the subject and keep you updated.
Again, Michal thank you very much for your help.
And, Tim, congratulations again for this amazing ENB file!! It has made my sim look like another simulator. Switching the tweak on and off using Shift+F12, makes a huge difference!! It transforms the image from computer graphics to cinema quality graphics! Thank you!