Great! Thank you very muchEDIT : Ok I figured it out. The problem was with the search/filter function, it messed up with the expanded/collapsed state, because I needed to expand collapsed nodes that had children matching the filter and then when you reverted back to the general view without filters the nodes opened by the filtering stayed opened, and that was confusing. But now the program keep two states for this (one for the view without filter, and one when filtering) and it seems to work great thus far. Will be rolled in next release.
EDIT: Maybe a single button to collapse everything would be good, or an option to always start collapsed.