here's a screenshot before i exit the macerator's GUI https://imgur.com/a/NZE4B

and here's one after i exit the gui and come back in a second later https://imgur.com/a/OjZJk notice how the obsidian dust isn't in my inventory or the macerator's gui

EDIT: the same thing is happening with the compressor

Interesting.... i found no code at all that would cause a senario...
Also this is not a client bug only. Because even if the Item gets desynced the progressbar needs to be updated...
Just as proof make a video of it. Without any cuts when you can recause it... Because this seems strange...
(I did already take a look at the code and i try it out as soon i do 1.7.10 coding)

i forgot to mention that i'm using other mods as well, so i'll test it with just ic2 classic and see if the bug still happens

@escman1999 did it happen with ic2classic only?

if not then i am going to close this

testing now, it seems to be caused by another mod, you can close the issue

Thanks :3
1.2.0.5 development starts soon maybe the changes fixes it

just letting you know, the issue seems to happen with the FTB inventions modpack and a combination of some other mods, but i changed my modpack so that it uses the crackpack as a base, and the issue seems to be gone now

Yay :3

please let me know if you find anything, fortist, so spiger can hopefully fix it for the 1.2.0.5 release :D

This is happening to me as well. Custom Modpack. So Im trying to figure out which mod causes the bug, but I dont know where to start, since it also affects another mod I have.
Ill probably do the Tried and true method of removing half the mods and testing and repeat, tomorrow.

I may have found something, but the mod in question doesnt actually show up in the FTB Inventions modpack.
VTweaks.
After removing it completely, the problem doesnt occur as far as Ive noticed.
Adding it back in and changing a few config options also 'fixes' it.
Im thinking it may be the "right click harvest crops" option. Im completely unsure.

EDIT: Confirming that it is "right click harvest crops" I think something with that kind of interaction with your right click messes it up. I havent tested endercore's version, however. I dont know what other mods I have that have a r-click harvest setting. But they have never affected it.

thanks @Fortist. Well mine is done by the block. Their could be done by an event...