I got it working. Phew. Assbackwards windows firewall should be forbidden by law. It should be in the 'counterintuitive hall of infame'. 

Is that supposed to be "infamy", or "in flame"?  Because either would work well.  

As a general rule, I turn off UAC and the Windows Firewall immediately upon getting a new computer.  For products supposedly designed to be helpful, it's really amazing just how disruptive and problematic they can be.

No updates, by the way, on my various items I recently reported.  The only issue that I can consistently duplicate is the keyboard redirection problem that I mentioned at length yesterday.

Keyboard redirection failure can also be consistently duplicated if you've got Chrome with GMail open on your primary, and you are creating / replying to an email.

What exactly did you have to change in the firewall?

It sounds like the app is installing a hook thats grabbing the input before Multiplicity gets it.  I will look into if we can tweak that or not.

Cursor movement gets sticky when you reach the sides of the monitors. As soon as on top appears the popup about the control. Also it wakes the monitor up from the secondary computer even when you don't surpass the side. So far no other major problems. Apart form the odious Windows Firewall setup is indeed as easy as pie.

I'm afraid it won't do you any good but here goes: As usual what you shouldn't do. First i disabled the entire firewall with gpedit. On both computers. No luck. Then i tried your suggestion of direct IP address, and the whole secondary computer was by now invisible. Not in the network, but only in Multiplicity.

So i turned the firewall back on, and reset it to default. I made a rule for the application, and nothing. I then turned of the firewall again because by now nothing worked as all my settings were gone.

3 seconds later Multiplicity was up and running. 

Kailef: We responded to your support ticket by asking for some logs, did you get our email on that?

I am sorry but I don't quite understand this.

As soon as on top appears the popup about the control = ?

I've finally gotten MP2 up and running, and connected.

Awesomous maximus!! Love the new GUI. Way easier to configure than older versions!

Though.... had to disable the XP firewall (secondary machine) before a connection could be made.
No real biggie. Nothing important is stored on the machine - just XP.

Anyway.... One question regarding audio sharing:

Is that a one way deal only? Primary -> secondary/secondaries?
Or is it possible the other way too?
In that case, how?!

Audio sharing is enabled on primary

but nowhere to "Enter the information below on the sending computers to send audio to this computer" on the secondary:

Snowy.  Try changing your secondary to be a primary, verify that you you have Audio, and then go back to secondary.

That was a no-go. Was unable to connect when switching around - even with fully disabled firewalls on both ends.
I suspect the XP network settings might be 'wunky'. It -is- a very old setup, installed on a totally different hardware configuration.

Might have to reinstall to get everything to work.

One other question/issue, this time on switching to primary from secondary:

My primary machine is a three monitor setup, secondary is a single monitor.
I have the secondary monitor placed above the middle (main) primary monitor.

I can switch to the secondary from any primary monitor, but when I switch back to the primary is always switches to the monitor on the left.
Something like this:

Will there be any options in the future to manage wich monitor to switch to on multi monitor setups?

XP does not support audio sharing.

DOH! >.<

Well, I'll slap on Vista instead then.
Half the (newly) installed applications aren't fully functional. Missing .NET (which needs SP3) and various other mishaps.

Thanks for the reply, Neil.