On Wednesday, Microsoft released Windows 10 Mobile Insider Preview build 15235 to phones in the Fast ring. The new preview emerged from the 'feature2' development branch, which Microsoft split from its main Windows 10 development efforts earlier this year.
Build 15235 introduced a new feature for Windows 10 Mobile - the first to be added to the OS since it introduced the feature2 branch in April. It also brought a range of fixes and other minor improvements, along with a single known issue, affecting HP's Elite x3 flagship.
But since then, Microsoft has added a further known issue to its release notes for build 15235:
ADDED 7/27: If you apps saved to your SD card, you may see error 8007000B when trying to update those apps. As a workaround, you can move these apps to internal memory, update them, and then move them back to your SD card. Thank you to all the Insiders who reported this to us!
The issue was evidently not identified before the build was released, and only came to Microsoft's attention after it was reported by Windows Insiders. While some might be tempted to criticize Microsoft for not spotting the issue sooner, it's worth remembering that this is the entire point of the Insider Program - to test the OS, and help the company find those issues that don't pop up in its internal testing.
Alongside build 15235, Microsoft also rolled out Windows 10 Insider Preview build 16251 to PCs in the Fast ring. You can view the fixes and known issues for the new PC build here.