eM Client v7.0.24859.1 - and yes, I know this is beta. Just reporting something for the developers to look into.
Right click any email and choose Move to folder. On both Gmail and GApp accounts a label is applied with whatever you select, but the current label is not removed, so in effect no move takes place. Example: you have a message in your inbox that you want to move to an Orders folder. You right click on the message, choose Move to Folder, and then select Orders. The label is applied to the message, but it does not appear in the Orders folder. It actually looks like nothing has happened, except if you go to the web client you can see that the Orders label has been added. The web client also does not show the message in the folder, only that the label has been applied.