Stuck at table in 'Season Unending' in High Hrothgar

[pinksponge]

I've had to reload my save three times now, and sat back down at the table to negociate a truce with the Greybeards, but at one point, everyone stops speaking. The characters are breathing, but are otherwise still.
The problem is that I can't get up from the chair, or do anything for that matter.
Can anyone help me?

I'm playing on the PC by the way.

 

[Touchstone]

I found this:

• NPC's stop talking and you are unable to talk exit your seat, or it is impossible to continue creation of the treaty. Encountered this bug on PS3, PC and Xbox 360. PC players use "setstage mq302 300" after NPC's are seated at the table and you will complete the quest, you should be able to continue by talking to Esbern. No fix for PS3 or 360.
• If the meeting does not start after you have taken your seat; stay seated and wait 24 hours and the meeting will trigger.