The SKSE plugin version is TESVAL.dll. You most likely downloaded ScriptDragon which uses dinput8.dll, as the old version of TESVAL that used dinput8.dll will cause everyone to crash.
I am sorry to have to say this, but you are totally incorrect on both counts.
- I have never downloaded ScriptDragon, and dinput8.dll indeed originates from TESVAL-1.3.10.0-2011-12-22.zip, which I had downloaded earlier.
- The TESVAL dinput8.dll does not cause a crash when placed in SKSE\Plugins, and indeed seems to improve my FPS, and to create the introduction script bug.
It is not a good thing to make too assertive posts based on nothing but assumptions.
The script is working fine with SKSE. You need to remove TESVAL.dll in Steam\steamapps\common\skyrim\Data\SKSE\Plugins folder. Where did you get dinput8.dll? Something is really messed up on your side. And yes, with renaming it it still will work. You need to rename extension of it to something like TESVAL.dll.bak or remove it from the folder.
The last phrase here is exactly to the point. Not really messed up, though, merely an earlier version with a different name, apparently.
Ehm... to clarify dinput8.dll is the name of the old DLL that only worked with executables that didn't require steam to run and it seems you had to place it the game's root folder for it to work. If your executable was Steam dependent then it would just crash the game on startup. The SKSE plugin version of this is called TESVAL.dll (someone correct me if I'm wrong) and requires SKSE and has to be placed in data/skse/plugins.
If you have the SKSE version the name doesn't matter, SKSE will still load it regardless of name. If you have the oringinal non-SKSE version then renaming it should work... but then again if you don't change the name it shouldn't even let you start your game under normal circumstances.
Some things here seem right, some to don't. I am running 1.3.10, which is Steam dependent, naturally.
I don't really mind all these slightly confused replies, because we are on the Internet, and I was using a slightly older version of TESVAL, after all. However, I felt I had to react to the large number of false statements involved, just to get the record straight for the general benefit.