[Qgis-user] Something strange with the memory

[Laurence Béchet]

Hi,

I've have experienced recently on several occasions a strange behavior 
of qGIS with what I think, memory. I cannot reproduce with a basic 
example, I need my whole project to make it happen.

I'm working for a conservation project and I've got a set of shapefiles 
with streams, tracks, contours .... and our traps and baitstations (we 
do pest control). I'm currently trying to make maps of bird census for 
our end of year reports.

Most of the data I get are from GPS, which is easy to handle (either the 
gpx file of by importing a csv file). But I also have to create 
shapefiles (points and polygons) to place bird sightings and draw 
territories. These files don't have any columns for GPS coordinates, as 
I draw the points or polygons using field markers (sighting next to a 
trap or near a track). So I create the shapefile, fill it in with a few 
data and save it, then fill it in with more data.
Everything goes well until the moment I save the shapefile again. It is 
saved but the points or polygons get all mixed. They are at the good 
place but not for the bird they were supposed to represent!

I spent 2 days trying to understand what was possibly wrong and the only 
way I managed to make it work was to create a new shapefile each time I 
saved new data.
Unfortunately,  after 4 or 5 times I saved files, qGIS starts 'not 
responding', a lag which the first times is some seconds and becomes 
several minutes and then I have to reboot the computer.

Is there a way to trace what is happening? Nothing appears in the log 
messages nor in the windows event logs, it seems.
I'm using windows 7 pro 64bits , qGIS 2.12.1-Lyon  code revision 
16760fd. Same problem with 2.13.0
I'm not connected to any databases, just working locally, no WMS 
connection and qGIS takes already ages to load the project (~3min). It 
never happened to me with the old versions like Dufour.

Any hints about what to check, look for would be much appreciated ...
Cheers
Laurence




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