Al Rosenberg at FSDT forum gave me a head-up, which helped to fix a very nasty bug. It was in weather requests. As it appeared, for some missions FSX answers weather requests, for some doesn't. I don't know why, but will try to find the answer. The weather condition is used to determine some CASE parameters. So, if the weather is unknown, vLSO can't find a carrier.
The 0.6.4.1 beta is free of this bug.
PS. I have added to the sidebar a full 0.6.4.1 beta package, so those starting from scratch can get it and use vLSO immediately. But read the included PDF first )))
PPS. I'll be removing the bottommost links as they become obsolete.