hi Iaq,
you have posted after a looooooong time,welcome back!
Regarding your problem,it actually has a simple solution...you have to reconfigure your controls EVERYTIME you restart the game or your pc.I know this sucks but you will have to do it.
Thus,simply go to options and just reconfigure yoiur controls{no need to change the keys...just select the relevant button tabs and re-select your choice key} including the arrow keys...that's very important.
Cheers