Hi Jacek - go to k2 parameters and you will see the settings to change - see attached. I dont fully understand the settings but it worked for me - dont forget to install jqueryEasy plugin and set like I did - hope it works for you
I also resolved this problem but Paul solution was not good for me. MiniK2 module was OK but other module on this side - JO K2 Slide show wasn't working good. For me solution was changing version of jquery in k2 parameters to 1.10 remote.