I would like to warn all players on the Expert mode infinity pack, that there seems to be a strange bug with Immersive Engineering Crusher machine. Yesterday, I dumped around 600 nether ores into the machine only to have around 400-500 of them disappear. The cause of this is unknown to me, as the machine worked flawlessly until that point, but I managed to repeat the problem 2 times in a row, then I took the crusher apart and replaced it with alternate means.

Therefore I strongly recommend all players to NOT use this machines if you wish to evade this bug (there is quite a few alternatives, so this shouldn't be too complicated for most).