It's a known and very annoying bug. Issue was already reported in: http://hub.qgis.org/issues/7321 http://hub.qgis.org/issues/7472
2013/4/23 Mathieu Pellerin <[email protected]> > Greetings, > > I've filed an issue over the weekend which IMO is a really serious > regression which shouldn't be left unresolved prior to the imminent > 2.0 release. > > Long story short, when a layer symbology is set to categorized, > graduated, or rule-based, all features will disappear when editing > feature(s) on that layer (by moving feature or one of its vertex). If > the user then leave the edit mode (saving changes or not), all > features will reappear. > > When features disappear, an error pops up in the log window saying > "Already active iterator on this provider was closed". > > Data itself is not impacted, but it's a super scary behavior for the > average user. It got me to cancel edits many, many times before I > understood what was happening. > > Issue filed can be reached here: http://hub.qgis.org/issues/7660 > > Mathieu > _______________________________________________ > Qgis-developer mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-developer >
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