Hascet migrated from myBB to vB and kept all the member info and posts. im sure it would be really easy to migrate from vB to vB
maybe get a new host too. what one are you using? maybe email other people using them to see if they have the same problem. check reviews on them. ill look into them if you give me there name. we could help you choose a new host if you want. also is the server located in the UK?