I have been using a custom resource pack which includes 3D models for a digital clock. This works absolutely fine in vanilla minecraft.
Heres the link to download the resource pack:
https://www.dropbox.com/sh/fm57am9tke0q1bs/AAC8PdzvKupUyxpQG0ikSeiMa/%5B1.9%5DDigital%20Clock%203D.zip?dl=0
The page from the author (it's in japanese, download link from above is also on there at the bottom):
http://ch.nicovideo.jp/popooiu/blomaga/ar957305
As I said this resource pack works perfectly in vanilla 1.10.2 minecraft. However as soon as I installed minecraft forge for 1.10.2 (the latest version) and put on the resource pack the clock would be frozen at 11:59. The 3D model would seem to load however the clock would not animate at all (keep track of time). Keep in mind that at this point I had not installed any mods, other than forge.
I have absolutely no clue why it would not work, perhaps it is forge messing with models? I cannot find any options at all to fix this and have had no luck finding any other people with the same issue.
I hope I can find a fix for this soon, as I really enjoy playing with this resource pack and playing with mods.