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I recently downloaded QGIS 2.8 and opened an existing project in it to check how it handled it and make any changes required. This project includes several raster heatmap layers.
My problem is that many of these raster layers seem to have shifted by a significant degree (but not all of them so additionally confusing). At first I thought it was a styling issue but then realised they were being displayed outside of the visible area.
They all have the same CRS set (EPSG: 27700, British National Grid), the project is set to this also.
I can see no differences between the settings for the affected raster layers and the single unaffected raster layer. Some of the affected layers are .ntf and some are .tif. The one unaffected layer is a tif.
Re-importing the layers doesn't seem to help. Creating a heatmap from scratch leads to the same problem, very odd!