@remram44 Interesting. I have a feeling that the error is due to the first region being unloaded but its entities not being cleaned up properly. "err 1281" is the OpenGL error GL_ERROR_BAD_VALUE which ultimately means some of the rendering data was corrupted, and "pure virtual method called" is an extremely unhelpful message that comes from Bullet physics internals but also has to do with corrupted data. There has been a Heisenbug I haven't been able to track down, so I'm guessing that got you. It is rare though.
The second time, I'm curious what text you saw? I'm guessing that the "chase" sequence never properly activated, since checking for you to enter the cave only happens during this sequence. I think perhaps if you run from the dogs too early the game won't realize they are chasing you. The expected sequence is :
"Better back away slowly..." => [moving away from the dogs triggers their AI to start running] => [the game checks the AI state of the dogs to see if any are in the RUN state] => "F*** Run!" => [The game checks to see if the player has ever used the SPRINT action before] => [If not, show an info tip and set a 5 second timer] => [if 5 seconds elapsed OR the player sprints begin the CHASE sequence].
In my tests all these steps worked but the ordering is important so it's very possible the game got confused somewhere. Anyway thanks for letting me know these are issues. I'm not sure how much I can do to fix them at this stage but it is good to know.
As for the mouse look, I'll double check the release version has the fix applied correctly. By default, horizontal motion should be correct (move left = look to the left) and vertical movement is inverted (move up = look down). This is configurable by specifying values in mouseconf.txt in the executable folder.