When I open my wallet, he starts loading, but nothing happens. What do i have to do?

[Omor12-2]

When I open my wallet, he starts loading, but nothing happens. What do i have to do? I already downloaded the nieuws version, but still have the problem. Sometimes I get this message: Checkum mismatch in gedownloade node! MD5: e05524cc4f6e8711645f40ef5921918a Instal Geth node 1.8.23. Who can help me?<!--

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Originally posted by @Skullettter in https://github.com/ethereum/mist/issues/4226