Actually, on further investigation, it seems to be a problem
to do with opening the original RH5 project in RH7. If I create a
new RH7 project, and add conditional build tags, all is well. The
only workaround I can find is to create a new RH7 project, then
import all the topics from the old project. If the tags in the old
project are then added to the new one, it will compile with tags.
However, this is messy, as importing the topics seems to lose the
TOC and index, and graphics links are messed up, etc. So, I would
like a fix if at all possible please!