I notice like many times in this forum, the actual question is never answered, rather a tirade about something which was not asked.
Bravo! I agree. Unfortunately My responses were of a 'my thoughts about that' nature aswell, I cant answer your original question however, since I simply dont know enough about chameleons specifically.
As A keeper and Breeder of reptiles for many years however, my first thoughts were that if you are housing together, or introducing only specific pairs, this may well play a part, as experience has taught me with other species.
Something to consider is to introduce the male to the females enclosure rather than vice versa. The change in surroundings wont bother the male from whats on his mind, so to speak, but the females may be a different story, if stressed she may become non receptive.
With this in mind, often breeders have more success on introduction, if they are not housed together for the rest of the year, but only introduced in the breeding season.
Im not sure why this so, but if you consider that two animals in the wild during breeding season, are likely to have met for the first time, its reasonable to assume that perhaps if they are housed together year round, intrest will be less (on the females part) 'familiarity breeds contempt' kind of thing.
Finally, not relying on the pairing of only one male with the female. Many breeders introduce multiple females to the stud male (not at the same time ofcourse) so changing the male you introduce may prove effective, eg she may be receptive to a different male than you had in mind. 'the eye of the beholder
Just some ideas!
and behave like he's a beginning of all cross breedings
