BETA 5.7.0.6: strange group behaviour

hi,
having 3 groups
group1
-group2
-group3
and currently only group3 contains a session
adding a new session while having group2 highlighted results in adding it in group3

also i played around with the groups (the "..." button on "edit session") and resulted in something like
group1
-group2
-group3
-group4
-group5
-group6
-group7
where only group5 got a session .. all other groups are empty .. they are not shown in the session list (RDM main window) .. but when clicking the "..." button on a new/edit session they appear and can not be deleted ...

just checked .. same behaviour in 5.6.3.0 ...

could you either automatically remove emtpy groups or add a button to delete those ...

KR
plague