Niantic has updated the official Known Issues support page for Pokémon GO. Read on below to learn more:
Known Issues
Issue description: Sometimes Trainers will see a black background instead of the intended green or purple background when accessing the Pokéball Menu or Pokédex on older iPhone devices.
Issue status: Resolved in upcoming release
Issue description: If Trainers have a task that requires that they do a certain amount of super effective Charged Attacks, the task does not progress if a super effective Charged Attack is used during a Team Leader battle or a Team GO Rocket Grunt battle. This is currently affecting Field Research Tasks as well as Level Up Research Tasks
Issue status: Mitigated in upcoming release (0.229). A full resolution will be implemented in an upcoming release as well.
Issue description: Some Trainers are not receiving in-game notifications such as raid invitations and do not encounter Team GO Rocket balloons.
Issue status: Investigating. If Trainers open all Gifts they have received, this may resolve the issue in the meantime.
Issue description: Some weather-related visual effects such as rainy weather have been temporarily disabled as we investigate a bug.
Issue status: Investigating
Issue description: Trainers may experience issues enabling or disabling Adventure Sync, or may experience inaccurate distance tracking.
Issue status: Mitigated in release. Reinstalling your application and re-enabling all permissions in device and application settings may help resolve further issues.
Source: Official Pokémon GO support page
Source: Pokemon