over 1 year ago - Juber - Direct link
The issue is reported.
For now you can only try another Browser (or app) until it is fixed. However, you don't have to fear, that you might not be able to collect them, cause every uncollected reward will be added to your inventory once the event is over :)  
over 1 year ago - Juber - Direct link
heliman1 said: @Juber: The problem are the gems. Some of them are a prize afaik, I paid €24,99 for the prizes and the gems are useless at the end of the game. Right?
There are no gem rewards in the extra lanes.