Latest daily Win 64 build
Dragon History English with Czech dubbing from this page:
http://www.ucw.cz/draci-historie/index-en.html
Load the savegame. Right click on the troll to speak. While the dragon is moving to the troll, if you open the inventory, after you end the dialog the game is broken. The dragon glides over the screen and you can't exit the scene or click on anything. Reloading doesn't fix it, you have to restart ScummVM.
Replicated with dh-cz.zip datafiles with the latest Git master i.e. ScummVM 1.7.0git1633-g023914d-dirty (Sep 6 2013 20:53:49) under Linux x86_32.
Ran with valgrind. No reported issues, so this is likely to be a logical or scripting bug in the engine related to opening the inventory during dialog... which probably should be blocked. I used "i" key to open the inventory so will need to check the engine code for this.
This can be replicated with the latest dh-cz-2012 datafiles and with the English datafiles using the attached savegame...
Pull request for this bug: https://github.com/scummvm/scummvm/pull/443