Please tell us some basic information before asking for help:
Model Name: ZF9
Firmware Version: 32.2050.2050.34
Rooted or not:no
Frequency of Occurrence: all the time
APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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So, some apps , even some stock like clock and calculator, does not want to start in fullscreen mode. I put them in fullscreen mode in settings, but that turned out to be useless. It was like that even before last update
