we know about all these problems. Today we are testing the last version of dfwiki and new wiki to be released next monday. If you have got backups of your dfwikis we'll be able to import it in dfwiki either in new wiki, however we suggest you install new wiki in 1.6. Now please wait untill monday. If with mondays version you're not able to get back your wikis, please send me the backups and we'll try to fix the import export mechanism.
Holds on just a lilte more, I' dont want to release the next version untill I've made some testing, anyway there will be bugs
but we'll be here to fix them fiercelly!
Ludo