Here is a summary of my situation:-

1. I am running the most current version of Crossover (12.5.1) - are you recommending an earlier version (i.e. 9.1.x)?

2. This issue started "out of blue" - I had made no changes whatsoever to Crossover or KVS. All of a sudden KVS asked me to (re-)enter my licence key for no apparent reason (which I did) then asked my to (re-)enter my FF numbers for each program (which had been entered many months prior). After this - I started getting the Error 15057 using the AC/StarAlliance method - other methods still work (note the JL method has never worked).

3. Subsequently I have upgraded both Crossover and KVS to the latest versions but the problem persists. (I even de-installed KVS and started over from "scratch" so to say as this approach worked some time ago when KVS started looping for no reason and my request for support did not offer anything useful).

4. The problem started happening on 3 different Macs (2 running Lion and one running Mountain Lion) - in each case, KVS asked for the licence key to be re-entered, etc, etc as in point 2 above.

I have tried, to no avail, the various tips on both the KVS and the Crossover support web-pages.

So KVS-support, can you please explain why you are sure this is a Crossover problem and I will take this info back to Crossover support. Could it be an issue related to the Aeroplan web site - given that it's the AC method that is failing. Of course this would not explain why KVS all of a sudden "lost" my licence key(s) and FF details. (This has happened in the past but upon re-entering this info everything worked fine again).

BTW - I am a very computer literate / Mac savvy person so I don't think this is some sort of silly user error. Taking the VirtualBox approach is an option but not one I am too keen on as KVS is the only Windows app I use. Are there any plans for a native Mac version of KVS?