Hoster 3.300 and the latest 3.301, use a different method to import Multisession discs... including the last track with the correct length. We tested with a number of Multisession discs and didn't find or have our Beta Testers report any that won't import. I don't know about the SC3314 - SC3400 series.
Did you ever try to import any of the SC3314 - SC3400 discs into Hoster 2.**? If so, what was your results? If not, then SC may have started using a new COPY PROTECTION method that is non-standard.
