The latest block on the Windows 10 1809 upgrade has been applied to systems running Morphisec's Protector enterprise endpoint security and apps that use the company's software development kit, which includes Cisco's AMP for Endpoints.
According to Microsoft, the Cisco and Morphisec applications can interfere with the ability to save Office documents on systems running version 1809.
Organizations that wish to proceed with the Windows 10 1809 update are advised to uninstall the affected applications until Cisco and Morphisec release updated versions.
"We are working with Morphisec and Cisco to address this issue in updated versions of their applications," Microsoft notes.
The company still has blocks in place for wrongly released Intel display drivers that break audio, F5's VPN, some Trend Micro security products, and unsupported AMD chips.
Last week Microsoft removed a block on iCloud for Windows after Apple released a patch that was compatible with the latest version of Windows 10.
Microsoft is still working on a fix for the mapped-drives issue that it confirmed in mid-November. However, admins first noticed the problem on Microsoft's first release of Windows 10 1809 at the beginning of October. Initially Microsoft said it would have a fix available in "the 2019 timeframe", but recently pushed that forward to November.
Given November has passed without a resolution, the company now says it "estimates a solution will be available by early December 2018", meaning it may arrive alongside next week's December Patch Tuesday update. Or not.
SEE: 20 pro tips to make Windows 10 work the way you want (free PDF)
Finally, Microsoft has added a link on its Windows 10 1809 page to Intel's support page about the audio play-back issue after updating.
Intel notes that audio on connected monitors might not work with Intel Graphics driver versions 188.8.131.5244, 184.108.40.20645, and 220.127.116.1146. The drivers were inadvertently released to several PC OEMs.
"These three Intel Graphics driver versions were only made available for a short time to a limited number of computer manufacturers and these versions were not posted in Download Center or in the Intel Driver and Support Assistant, so please confirm which Intel Graphics Driver is installed on your computer before taking any action," Intel notes.
The chip maker has also posted a video demonstrating how to check which driver is installed. Intel says it is working with Microsoft on a new version of the driver for OEMs to distribute to end users. Intel believes the drivers were not widely implemented.
Update December 6, 2am ET: Cisco said it is aware of the compatibility issue and an updated version of AMP for Endpoints will be released on Thursday, December 6, 2018.
Previous and related coverage
Microsoft unblocks the Windows 10 October 2018 Update for one group, but several other blocks remain in place.
Microsoft blocks the Windows 10 October update for iCloud users, while incompatibility problems also hit F5 Network's VPN.
Flawed updates cause Outlook and other apps to crash.
Steer clear of the rereleased Windows 10 October 2018 Update, IT pro warns. Meanwhile, Microsoft promises fix for buggy mapped drives at some point next year.
Mystery bug is telling Windows 10 users that their legitimate license is no longer activated. Microsoft is working on a fix.
Microsoft rolls out a preview fix to address the Windows 10 October 2018 Update ZIP copy fail.
Intel accidentally pushed an incompatible audio driver to Windows 10 devices through Windows Update.
Admins struggle with the latest Windows 10 1809 patch on some HP systems.
Microsoft makes changes to its Feedback Hub after failing to notice early reports flagging up data losses caused by the Windows 10 October 2108 Update.
Back up files before upgrading to Windows 10 1809, and if you get a warning about Intel drivers, do not proceed.
Microsoft is starting to roll out the Windows 10 October 2018 Update today, starting with Insiders and those ready to proactively grab the new bits.
Windows 10 is getting a big update in its next release. Here are some of the enterprise-centered features to expect in the Windows 10 October 2018 Update.
Plus: Windows 10 October 2018 Update is now available.