Playing around a bit the other day (implementing the speedfix to Metablock) and I noticed that if you lock metablock or metafire scne they all mess up after about 2 minutes. The blocks spread out tooo much (I cannot work out which axis x,y,z or all together) and the screen goes very blank as the balls are off the screen. Try it yourself.
I looked at the code and could not work out why it is doing it.
Now initialy I thought this was not much of a problem as it is unlikley that anyone will lock the scene for 2 minutes but sadly switching scnees does not reset the problem either. All the metaballs still are spread out.
(I left R4 running overnight to test and in the morning the metablock scnes looked wrong again)
Simple test in your predefines folder have metaballs another scene and a fader leave for 5 minutes and the metaballs will be all messed up.
Obviously in R4 in running for long periods of time anywhere this scene will look like a blank(-ish) screen after a day or so and that is not good.
Could you look into it.....