OK. The NanoWallet is the latest version, it becomes the Universal version.
My environment is the same OS, different browser only.
I am using Google Chome.
Here, there are three servers that can not be used in the node list, san, go, alice4.
Perhaps there is a possibility that you can not successfully connect to a free node of harvesting.
I will list a node with many vacant slots below, so please try it.
157.7.196.116
27.134.249.71
45.63.78.67
alpha.nemspace.com
bravo.nemspace.com
juliett.nemspace.com
tango.nemspace.com
160.16.179.229
160.16.180.10
160.16.180.12
160.16.181.50
163.44.168.42
160.16.179.214
103.11.64.53
Perhaps there is a possibility that something wrong information is stored in the database that NanoWallet memorizes.
In this case, try using Google Chome or FireFox. When using for the first time, since there is no wallet information in the browser, importing from the wit file is necessary.