Hey Craig,
We have been using Ekahua for the past 1.5 year, mostly for pre survey simulations and post survey analysys. I have not seen any issues with CTX mode however we have had various other anomolies with Ekahua in general.
I personally find Ekahua support exteremly lame and useless. I have been trying to get an update for our corportae version 2.1 for a while but Ekahua claimes there is none - However after listing to our issues they claim we can have them resolved in the next full version upgrade which will cost us over $3000.00.
Talk about "real customer service"