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While I was working on cartographic files (QGIS 2.18.16 - Linux Mint 18.1) using the rule-based styling window, suddenly the window and the program freeze and I can not longer work on editing. By closing and reopening the project file (and also other analogues other than those on which I was working) the problem remains (if i try work with the rule-based styling) even after uninstalling and reinstalling QGIS updating it to version 2.18.22. Opening the same files with version 3.2 the problem does not seem to exist. I would like to continue using version 2.18.x ltr up to the next 3.4 ltr, can this problem be overcome? Can it depend on the existence of a cache related to the rule-based styling window that is no longer accessible?

I add some informations: 1-it seems that the block occurs only when the rule-based styling window is open 2-the files I've worked on are on an external USB hdd 3-coinciding with this problem I detected the unwanted creation of a second mount point for the external USB hdd while the previous one was not accessible and with the root owner 4-also restoring the mount point setting as before the problem remain

Update 2018-28-07: I found that this problem was already reported as a bug here: https://issues.qgis.org/issues/16778 but I did not understand if it was taken into consideration or if we need to propose it again.

  • Any rulebased styling, or specific data and/or rulings? – Erik Jul 26 '18 at 15:20
  • I tested with two different qgis project files based on different .shp datasets (i.e. if i open the rule-based styling windows and try to add and/or modify a rule the window and qgis itself freeze. – Andrew-63 Jul 26 '18 at 16:41
  • What do you mean by "other analogues other than those on which I was working"? Do you have more than one QGIS project open at a time? – csk Jul 26 '18 at 18:49
  • Sorry for my English, I mean that the same problem also occurs with files other than those on which I was working the first time it occurred (for this I do not think it is a problem of file corruption) – Andrew-63 Jul 27 '18 at 0:05
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I Just Had The same problem on QGIS 2.18.24, eventually I succeeded creating Ruled Based Styling by editing the style through the 'label toolbar', via 'Layer Labeling Options' button (instead of opening the style from the Layers Panel Properties).

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