Update, Dec 8, 3:33pm EST: Explorer Pop-Up Cup has now been re-enabled. All scores from December 8 will be removed due to the lack of availability.
The Explorer Pop-Up Cup has been re-enabled for all regions! EU will be able to participate for the next hour, but all scores from today will be removed in the future due to today's limited participation window.
— Fortnite (@FortniteGame) December 8, 2018
Epic Games have disabled the Explorer Pop-Up Cup playlist in Fortnite, as they attempt to address an issue regarding materials not being held properly by players.
The Pop-Up cup mode got some adjustments made for Season 7, rewarding players with building resources, as well as health/shield for each kill they get – incentivizing players to go for more kills.
The resource gathering rate was also increased by 40 percent and Supply Drops were increased for later in the game too.
However, players reported issues surrounding the materials, where they were limited to only one single resource – effectively preventing building altogether, as players joked they were now playing PUBG, rather than Fortnite.
It seemed to be a more frequent problem on OCE and Asian servers, although players globally were reporting the bug, with players have a material cap of 1, rather than 700/500/300 as intended.
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Due to the severity of the problem, the Explorer Pop-Up Cup has been disabled temporarily as an investigation is completed and a fix is rolled out.
We're aware of an issue where the Explorer Pop-Up Cup is not allowing players to hold the correct amount of materials. We'll be disabling the Pop-Up Cup as we investigate.
— Fortnite (@FortniteGame) December 8, 2018
Presumably it will be a straightforward repair, and considering the Pop-Up Cup is a limited time mode, Epic will know that it is crucial it is fixed as soon as possible.
The Pop-Up Cup settings are the same as those used in the Winter Royale, and so are also the best practice for players challenging in the finals of the $1 million open tournament.
We will update this story as Epic Games provides more information on the issue, and when Pop-Up Cup is re-enabled.