Weird TWR in 0.90?

[NERVAfan]

I just updated to 0.90 and now the TWR of rockets seems too low. I have a 12.7 ton rocket on the launchpad and a LV-T45 isn't lifting it (I even right clicked on the engine and saw that the displayed thrust was definitely high enough, so it's not a throttle setting problem). Is this a bug or did they change Kerbin's gravity or something?

[Streetwind]

There is a bug with the tier 2 launchpad where sometimes rockets get stuck in the ground.

If you have a tier 1 or tier 3 launchpad, or if you're using launch clamps or make the rocket stand on decouplers below the engines, you shouldn't suffer from this. Also, sometimes simply recovering the vessel and trying to launch again works.

[Janos1986]

Launch clamps, always use them when available.

[InterCity]

Can confirm the launchpad glitch.

A workaround is to put a decoupler below the engine, then decouple when you ignite the engine. It should be the decoupler that gets stuck. However, it increases your part count and price, so it's really annoying.

[eddiew]

Claw's Stock Bug Fixes includes one for the sticky launchpad issue. No need to fight your part count or cost, or worry if you forget a clamp