KOTR is supposed to be in the cave, just like the original game. If it wasn't there then something has gone wrong. Let me check the field script and see how this might have happened.
Edit: Field script seems OK, nothing that would disable the variable check or otherwise interfere with it. When you first entered the cave, was there a red glowing triangle like this one inside?: http://www.angelfire.com/freak/finalfantasy777/KOTRcavern.jpg
If there was no red triangle when you first went in, then it means the variable has been flipped elsewhere. If there was one, and you examined this and got nothing, then it might be due to a rare glitch that can occur where examining the Materia in one of the caves (except for the purple cave which has a different set up for the scripts) can cause the script to be skipped and no Materia given.
I should warn you now as well that KOTR is protected by a boss fight that will be difficult to win on Disc 2. All the Materia caves should have a boss fight protecting them as well; did you encounter those, or did the game let you pick up the Materia without any fight triggering? Just to make sure everything's patched correctly.
Thank you once more! The object was there at the far top of the glowing white/redish light. I hited confirm button crazy but i didnt found it later. Now I wandered around more and the scripted message showed up, the materia was to me given and the fight started wonderfuly.
I uploaded a screenshot from the light covering the object, in my personal website:
(I could not see your image/link, it keeps redirecting to
http://www.angelfire.lycos.com/doc/images/rloadblock.jpg, and I dont remember wich was the object like when I played ffvii back then) , but It may be probably be because of all the mods I am using from 7th Heaven, the light must be messed up or the object is missing texture or not visible, yet being able to trigger the event.
Sorry the trouble once more, im loving this mod! It bugs me so much not being able to broke the game using the KOTR now and omnislash, but its so much more enjoyable playing with the new balance, otherwise I would be pouding every enemy and that is no fun at all like quick attacks in FFX.
Its a very well deserved of praise your work man, keep it up! Greetings from Portugal, Lisbon!