This happens only when building pan with gtk3.

I'm using the view where the groups panel is on the left, with headers and body
to the left (headers on top). [Note that this is wrongly described in
edit-preferences.]

Whilst reading postings, the divider between groups panel and the others will
jump to the left - the distance being variable. Once there, it cannot be
dragged back to the right although it can be dragged further to the left and
then back to its new position. 

Switching to a new group may free-up the divider. 

Reproducible: Sometimes


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See downstream bug 

https://bugzilla.novell.com/show_bug.cgi?id=728311