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I have three layouts that are associated with my *.qgs project file. Each layout includes at least one map and a number of text boxes that serve as captions for the map(s).

After a few days of formatting, my layouts are almost completely finished. However, some of the maps on two of my layouts no longer display as I edit the layout (instead displaying "Rendering map" on a completely grey background). For earlier versions of QGIS, the problem may have been that I toggled "Cache" or "Rectangle" instead of "Render," but these options do not display in this verions of QGIS (Girona, QGIS 3.0).

Importantly, if I try to delete any of the offending maps, QGIS hangs and I have to force quit or kill the program. Also, I should mention that the offending maps successfully render when I export the layout to a pdf... I just can't see them while I'm editing the layouts.

Any ideas?

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    Are there any similarities between the maps that fail to render, that differentiate them from the maps that do render? If you make a copy of one of the maps, does the copy also fail to render? What if you duplicate the entire layout? – csk Jun 13 '18 at 16:25
  • It sounds like you've encountered a bug. Try to figure out as much as you can about the scope and circumstances of the issue, then make a bug report. issues.qgis.org/issues – csk Jun 13 '18 at 16:27
  • And if you haven't done so, make a backup copy of your project. – csk Jun 13 '18 at 16:27
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    Interesting; csk's suggestion to create a duplicate layout appears to have worked. The duplicate contains the maps, fully rendered. Thanks! I'll check back in if I can reproduce this solution on another project file. – keek3 Jun 14 '18 at 20:58

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