Windows 10 May 2019 Update users are hitting even more difficulties with the problematic KB4517389 cumulative update that was released earlier this month, and is now reportedly causing a Blue screen of death of Death, or boot failure, for some folks.

Unfortunately, as Windows Latest spotted, there are many users on Microsoft's Answers.com forum pointing the culprit at KB4517389 for any Blue screen of death of Death (complete crash from the PC) having a 'cldflt.sys' error message. That specific process - which pertains to cloud (possibly OneDrive) support - isn't the cause of the problem, according to a volunteer moderator on Microsoft's help forum.

Uninstalling the cumulative update fixes the issue, and at as soon as, that's the suggested plan of action for those affected.

Meanwhile, the bug continues to be reported to Microsoft via the feedback hub for Windows 10, and so hopefully it's being investigated. As well as this, another user is reporting a boot failure issue, there are seemingly some very nasty gremlins within the works.

Breaking Basic

There are further complaints that some apps are being broken through the KB4517389 cumulative update, specifically Visual Basic 3, which works again once the update is uninstalled.

Furthermore, apparently a lot of legacy 16-bit apps designed in Visual Basic 3 are similarly scuppered through the update, a corporate user reports.

A week ago, we heard about VMware 14 failing to operate in Windows 10 after installing KB4517389, and also problems with Microsoft's own Edge browser.

This follows a whole raft of other flaws brought on by the cumulative update including smashing the Start menu (once more - it was a highly unfortunate side effect of a previous cumulative update, too).