wallet file are not saved with sync status

[polar-it]

Hi,
on different platform windows 10 and MacOS using also version 0.22 after closing the GUI, the wallet file are not saved.
No error are reported , no daemon are running.
The effect is, every time reopen the wallet a full sync is required or sync from the last saved state.

To mitigate the issue as workaround, is required to sync the wallet via walletd, save the status and then reopen with Nest GUI, but the Nest GUI do not save the wallet

using walletd included on "Nest" Packages here are reported the error

2018-May-30 12:16:14.138048 INFO Saving...
2018-May-30 12:16:14.141079 INFO Saved
2018-May-30 12:16:15.036678 ERROR Failed to save container: boost::filesystem::unique_path: Key not valid for use in specified state
2018-May-30 12:16:15.042629 INFO Starting...
2018-May-30 12:16:15.044623 WARNING Couldn't save container: boost::filesystem::unique_path: Key not valid for use in specified state
2018-May-30 12:16:15.050604 INFO Stopping container
2018-May-30 12:16:15.052599 ERROR WalletGreen is already stopped
2018-May-30 12:16:15.054597 INFO Stopping...
2018-May-30 12:16:15.695879 WARNING Block processing is interrupted
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