Create group + copy + ungroup copy (after several attempts) results in copy disappearing + ungrouping of original group !!!!!

[G.M.]

Using Dia 0.97+git

I've come across this very annoying bug several times today:

1. What I do:
- Create a group with a) a CISCO "server with PC router" icon + b) short underlying text legend
- Copy this object and move it to its definitive place
(- enventually unselect everything + reselect the copy)
- Hit CTRL-Shift+g to ungroup the copy

2. This results in
- the whole copy of the group disappearing
- the ungrouping of the original group!!!!!

This does not occur everytime, but after several manipulations on my graphic, when it starts behaving like that, it wont stop... Even after a restart of Dia!!!