I posted this in the forums and have had it confirmed. I'm not registered to post bugs directly in the bugtracker so I'm reporting it here..
1.4.0rc5 on Windows XP (+ Debian Linux according to R Meho) I came across some odd behaviour which is quite easily recreated: 1/ create 4 text frames on a blank new page and add text to each one. 2/ group them. 3/ rename the group 4/ select one of the text frames (I used the outline dialog for this), and try to change the item's level either through the item:level menu or through the properties dialog. (might not happen for the first or last in the group) What happens: - The page goes blank - the item disappears from the outline dialog - the group's name reverts to it's original name - a polygon appears in the group (shown in the outline dialog) with the name given to the group in step 3 above. I've attemted to recreate the same problem in 1.5.0svn on Ubuntu (latest snapshot) but the behvaiour is different. The attempt to change levels simply does nothing. I've had a look though the changelog and can't find any mention of this being changed so I don't know whether this is a difference between platforms or versions.
