I found an interesting conversion problem.
I have this situation: (Note the escape-backslashs in the table)
When I try to convert it to xwiki 2.0 it fails with the error message: "Failed to convert the selected syntax. If you want to use this....", etc.
Unfortunately there is no stacktrace in the log.
When I try to convert each macro on its own it works fine. It also works when I remove the escape-backslashes in the table. So it has probably something to do with them.