If you guys are having issue finding match because Dota 2 asks for a map preference then GamingGamers.net have the fix for you. Just go on ahead onto the Play tab where you can find matches. Look down on the bottom where it says No Language Preference and click the Select button that is underneath it. Here you will find options for Classic Map and Themed Map. You can select either one or both, where classic would be the normal classic maps while themed would be maps where the current Dota 2 theme is played like the current Christmas theme.
via N4G: pc news feed http://n4g.com/news/1412274/fix-for-please-select-a-map-preference-select-both-maps-if-you-have-no-preference-dota-2-problem
via N4G: pc news feed http://n4g.com/news/1412274/fix-for-please-select-a-map-preference-select-both-maps-if-you-have-no-preference-dota-2-problem