I have your script Lokasenna_Track_selection_follows_selection
Can this be the culprit?
Code:
num_selected_items =reaper.CountSelectedMediaItems(0)
for i=0, num_selected_items do
source_item = reaper.GetSelectedMediaItem(0,i)
table.insert(items,source_item)
end
for i=1, num_selected_items do
reaper.SetMediaItemInfo_Value(items[i], "B_UISEL", 0)
end
track_with_items= reaper.GetMediaItem_Track( items[1] )
track_with_items_index = reaper.GetMediaTrackInfo_Value( track_with_items, "IP_TRACKNUMBER" )
num_tracks = reaper.GetNumTracks()
reaper.InsertTrackAtIndex( num_tracks, false )
reaper.SetOnlyTrackSelected( track_with_items )