Is it possible to go back to a previous version of TMM? one of the 2.7 versions had a feature I used and now 2.8 does not do it.
well, no, that's not inteded.
We do not want to have a big version fragmentation, since it's hard to find & fix bugs in old versions...
Better to report that bug, then staying at an old version... (as you already did)
which "feature" do you miss? (we basically do not remove features, but we could have changed it with 2.8)