With the latest version of MC (1.3.2) I built my mod stack around Forge universal 4.0.0.230 and I have about 40 mods playing nice at the moment. Recently I nnoticed an odd bug, End Stone had become a second Blaze Powder in the Item ID list, and mining End Stone give you blaze powder. I decided to go back to vanilla and do incremental steps to locate the mod with the issue, turns out it's Forge. So, I thought, maybe I should upgrade to the latest version... So i did that and discovered that it still has the End Stone problem. Alas...
Since I had upgraded, I dediced to pack in the rest of my mods, thinking that the new Forge would still work with them. No such luck. Two of them caused fatal errors: Runic Dust (wihich is so new I don't care) and Mo Food and Crops, which is too cool to lose. So ultimately I had to roll back to 230 to get it all working again. Still, I thought I might let folks here in Forge-land know about it so that it could be addressed, sometime.
My Forge-client lot:
I also noticed that the new Matmos requires Forge 4.0.0.249+ so I am hoping that this gets corrected. (I miss my env sounds)
-Llywylln