I'm encountering a slight issue that seems to be occuring at 'any' time during a remote session. The mouse moves around the screen and so forth - that parts OK... but when the mouse is clicked on an icon or a window header, it doesn't appear to set focus to the selected icon or window.
There have been times when it worked (the mouse clicks) for quite a while then simply stopped working/responding. And there have been times when I logged onto the remote machine and it didn't work from the instant of gaining full access.
I have noticed however, that if I simply move the mouse on the remote machine, when I go back to my primary computer - the mouse clicks, etc work again for a while... but eventually the mouse once again stops setting focus and hence one cannot double-click (or single click) an icon or move a window (of close one) anymore.
Otherwise it appears that everything has been configured properly as I can perform file transfers, chat sessions and so forth.
Hopefully the 'clue' about "simply having to move the mouse a little on the remote computer" seems to 'fix' the issue - temporarily at least.