Well I sent an e-mail to LM support with a screen shot of their website just hanging and not populating the availability dates (with either minimum number of miles or "not available") and received 2 responses as follows:-
It's a pleasure to greet you.
We recommend you to try again through another website, please try to avoid Safari, and attemp with Google Chrome, Mozilla Firefox, Internet Explorer, etc.
Besides, we apologize the delay in our response and the encountered experience while trying to redeem your ticket. We've escalated your manual booking request to our specialized department, reason why, we recommend you to be aware of your contact number as if the request is approved, they'll get in contact with you to proceed with the reservation.
We remain at your disposal.
Regards,
AND
It's a pleasure to greet you.
We apologize for the previous reply, please ignore it.
Regarding your request, we recommend you to try again through another website, please try to avoid Safari, and attempt with Google Chrome, Mozilla Firefox, Internet Explorer, etc.
On the other hand, we'd like to inform you that we may only assist you with manual bookings when you encounter any error message during the process; the lack of availability is not considered an error since the redemption agreements between each airline and each loyalty program are different.
We remain at your disposal.
Regards,
Well - the same issue happens on Google Chrome as well so the tip is not at all helpful - the comment about manual bookings only working when the website shows availability - again how can it if it just hangs ........
On the issue of LM (when it doesn't hang) not showing award seats that other *A airlines do - I personally believe LM's explanation that not all *A airlines have the same award inventory is a load of rubbish - while I do agree that some (in particular SQ, NH, LH) have some inventory for their members only - AC and UA do NOT for international routes so in all likelihood it's just another LM website/search engine bug.
I have another "off the wall" theory on the hanging issue - the route I was searching was MEL-YVR but LM won't let you enter MEL if you select AC as the airline in the drop down list (this is a fairly new route route for AC - about 2 years old !!) so you must use Smart Search - perhaps the hanging is caused by this - the date with availability (as shown on Aeroplan and UA) was the only date not populating.