Hi tokimay, best to use the cli on linux for now. A few people have had issues with the prebuilt linux GUI running and we are fixing.
For a quick fix you could try using the daemon from the CLI download and then you should be able to start up your GUI and have it connect.
The payment in the mining pool is slow and the Win wallet has not received any coins at all..
Slow pool payments are due to slow unlocked blocks with the big difficulty changes. The hardfork addresses this and additional funds sent to pool have helped too. For wallet sync issues please ask in the Discord or provide more information.