Grimrock

In Archives level, Time and Tides, throwing an object into the portal should land on the plate to close the trap door but instead that object is transported behind the bars adjacent to where you stand to through the object. If you can't pass the point you can't move on to the next level. Essentially the game is over. Does anybody know how to proceed?

Put a rock, throwing knife, or shuriken into a champion's hand and throw it from there (by attacking). Items thrown this way fly further than items thrown with the mouse. A bow and arrows will also work.

1st things 1st: failing to solve a puzzle ain't a bug of the game.
2nd: LoG implements some physics which means objects thrown or shoot won't fly endlessly.

drwellsjr wrote:In Archives level, Time and Tides, throwing an object into the portal should land on the plate to close the trap door but instead that object is transported behind the bars adjacent to where you stand to through the object.

Said object will in fact land on the plate when it is hurled with enough "force" or in LoG terms: the right way.