Server Setup Information:
Problem description:
If you have a board with multiple card lists there is no horizontal scrollbar to the other lists (those not visible because do not fit in your screen). See screenshot:

Manifest: Line: 1, column: 1, Unexpected token.
23f2bf5……js_resource=true:77 XHR finished loading: GET "https://minca.comunes.org/sockjs/info?cb=3c69fuciz6".
23f2bf5……js_resource=true:77 XHR finished loading: GET "https://minca.comunes.org/sockjs/info?cb=od3ig35s83".
sudo snap logs wekan.wekan ?019-01-27T02:22:13Z wekan.wekan[9235]: LOGOUT_ON_MINUTES= (default value)
2019-01-27T02:22:13Z wekan.wekan[9235]: DEFAULT_AUTHENTICATION_METHOD= (default value)
2019-01-27T02:22:13Z wekan.wekan[9235]: MONGO_URL=mongodb:///var/snap/wekan/current/share/mongodb-27019.sock/wekan
2019-01-27T02:22:22Z wekan.wekan[9235]: Presence started serverId=XXXXXXXXX
2019-01-27T02:22:22Z wekan.wekan[9235]: Note: you are using a pure-JavaScript implementation of bcrypt.
2019-01-27T02:22:22Z wekan.wekan[9235]: While this implementation will work correctly, it is known to be
2019-01-27T02:22:22Z wekan.wekan[9235]: approximately three times slower than the native implementation.
2019-01-27T02:22:22Z wekan.wekan[9235]: In order to use the native implementation instead, run
2019-01-27T02:22:22Z wekan.wekan[9235]: meteor npm install --save bcrypt
2019-01-27T02:22:22Z wekan.wekan[9235]: in the root directory of your application
@bentiss
Can you look at this?
Also experiencing this issue (Ubuntu, on both Firefox and Chromium). Please note that not only the scrollbar is not visible, horizontal scrolling (using swipe gesture) does not work either. I can't get to any cards that don't fit on the screen.
I found the reason.
Bugfix for Firefox rendering issue did hide scrollbar. After removing that, on Chromium/Chrome scrollbar works OK, but on Firefox cards are below of swimlane. Well, it's better to have them working on Chromium/Chrome than not at all.
I don't think it's good to go back to vertical swimlane, because changing it to horizontal swimlane did fix #2133
I will make new release with this partial fix.
@xet7
Thanks for properly fixing the horizontal behavior!
Most helpful comment
I found the reason.
Bugfix for Firefox rendering issue did hide scrollbar. After removing that, on Chromium/Chrome scrollbar works OK, but on Firefox cards are below of swimlane. Well, it's better to have them working on Chromium/Chrome than not at all.
I don't think it's good to go back to vertical swimlane, because changing it to horizontal swimlane did fix #2133
I will make new release with this partial fix.