My memory crystals won't go on the alters....I had collected one and it went on an alter just fine..then,I went and collected two more, but I can't place them on the little silver circular spot on the alter....

I tried clicking the alter with the crystals in my inventory....I tried having my character place them on the alter, but they just sit there, or fall to the floor.............duh...what do I do now.......thanks

Try pressing your spacebar on the altar.

And make sure you have the right crystal on the right altar. For some reason, I think it matters...

You might also post this to Misc Games, where the Holy MM series is discussed :D

As I recall the crystals had to be placed in a given order.