Thank you very much for your fast reply.

Hmm, I downloaded the newest wallet version from: https://alqo.org/#downloads

Then I deleted the blk00000.dat file, ALQO downloaded the chain again after restarting it but...

...now I do not see the error message anymore but the wallet window does not open. The program is active. I can access debug console etc but the wallet itself with the different windows (masternodes, receive...) does not open. Hmm, strange. I just have access via the toolbar.

It would be nice if you could provide a workaround.

All the best