I have tested AwareIM 3.0 (1024) with Internet Explorer 6+7 and Firefox 2
In Internet Explorer recalculated Fields are locked during recalculation, no user input is possible until the recalulation has finished.
In Firefox data input is during recalculation possible but the field values which have been entered during recalculation will be deleted after the recalculation has finished.
This is a major issue because the user data input could be wrong or something could be missing.
The best idea would be that during recalculation the whole form would be locked using an transparent white background over the whole page and a centered box e.g. Calculating... as many Ajax software solutions are doing. This fetaure would be very helpfull!
And other small issue is that in Internet Explorer calculated fields are grey and in Firefox the are blue using AwareIM Template 2.