OTRv3 [1] has been designed to somewhat help the problem of differing instances and has been available since libotr 4.0.0, but in practice I haven't found a good way to solve the UI/UX problem in a user friendly way. The latest beta builds of Gibberbot support the transfer of private keys from desktop to mobile, but I haven't tested it, or how well it works to transfer a conversation from one device to another.
mpOTR [2][3] is designed to solve a different problem, and I believe development has been stalled because the current design doesn't allow chatrooms to scale to large numbers of people.
mpOTR [2][3] is designed to solve a different problem, and I believe development has been stalled because the current design doesn't allow chatrooms to scale to large numbers of people.
1. http://www.cypherpunks.ca/otr/Protocol-v3-4.0.0.html
2. http://www.cypherpunks.ca/~iang/pubs/mpotr.pdf
3. https://github.com/cryptocat/mpotr