When trying to open a .r16 heightmap file, the file open dialogue doesn't permit entering size values above 2 digits. As a result, I can't open heightmap files larger than 99x99 px. This bug was introduced in Krita version 3.0. I'm using an iMac with OSX El Capitan.
Git commit 15662fd7ee89ff086aba1bba2a9abba65ee9b7ea by Victor Wåhlström. Committed on 07/07/2016 at 21:16. Pushed by victorw into branch 'master'. Allow user to input size values higher than 99 when opening .r16 files M +5 -1 plugins/impex/heightmap/kis_wdg_options_heightmap.ui http://commits.kde.org/krita/15662fd7ee89ff086aba1bba2a9abba65ee9b7ea
The UI could really use some love, but for now I just removed the limit so the feature at least works.