Regarding the arrow keys bug - unfortunately, we couldn't reproduce it here. It certainly has something to do with a specific machine or configuration. Without remote access we won't be able to diagnose it. We could schedule a remote session, connect to your Viewer machine and from that machine connect to a remote machine using your Viewer and try to diagnose the issue.
I would actually appreciate very much working in a remote session with you. Let me know how and when and I will make myself available.
Is this happening in 100% of all cases or only in some cases?
I have two computers in my office. Each computer is 99% a duplicate of the other (one might have some software that the other doesn't). Each of those two computers has two monitors. I have two callbacks setup on each computer. At home, my one computer has two monitors. So, at any given time at home, I might be viewing any combination of these 4 remote monitors on my 2 local monitors.
Each of the two remote computers exhibit the same problem of not being able to do any kind of input only occasionally. So, if I happen to be focusing on Computer 1 and computer 2 has logged out, sometimes I hit the CTRL-ALT-DEL button and the remote screen prompts for password, but I can't input anything into it.
It isn't 100% of the time and I don't know if it does it with any other hosts because I'm not really on any others that often.