To solve this, do the following:
1) back up the contents of the folder (PS folder)/art/world to a separate folder
2) Either set the client to \"load all maps\" or move to the oja road and quit there
3) run the client with the parameter -relight
once and enter the game (if you moved to the hills, you need to use that same char, obviously). This will take very long, even on fast computers it may be 30 minutes if you load all maps
4) quit and write-protect everything in the aforementioned folder ((PS folder)/art/world)
except \"hyojapath.zip\" and \"lighting.xml\"
5) copy the file \"hyojaroad.zip\" from your backup folder to (PS folder)/art/world
Explanation: the lighting is computed incorrectly for the ojaroad, the forest and Ojaveda east. However, Ojaveda east will get recomputed faultily but it\'ll be a little brighter than before, and the forest will even be darker, while the hills will be perfect and everything else more pleasantly lit (IMO).
That\'s why you recompute the lighting in step 3
The update server, however, holds the incorrectly lighted maps, and to prevent the updater from overwriting the relighted maps with the faulty ones, they are set to readonly in step 3, which makes the updater skip them
Step 2 is used to make sure that all (if you select \"load all maps\" ) or just the hills (if you move there) are relighted. Loading (and thus relighting) all maps may not be feasible if your computer is low on RAM and / or performance.
Step 1 is to have a back-up in case something goes wrong, so that you won\'t need to download the files all over again using the updater.
In step 5 you replace the even worse relit version of the forest with the slightly better lit original. This means you won\'t have to run the updater to get the file back, saving time and bandwidth.
Now the sun will have risen in the hills.

Note, however, that this will prevent any updates to the readonly files, so if they get changed you\'ll still have the old version. This is a temporary solution until the bug is fixed by the team, not a permanent bugfix!