I noticed that when I exported a block TG to XML and made some changes to it and imported, the Basic OPC/Group Items names had been converted to their driving tag path from just a name.This caused issues as the name was been used in the triggered items so this led to broken links. Luckily I only had a few of these to do so I just copied the group and made the changes to each of the items but the import/export is a very useful feature which worked well in version 7.
Group Before Export.
eg Lind_ID has driving tag path.
After Import the Basic OPC Items are changed to driving tag paths.