Microsoft has revealed that build 17133 was proving problematic and the company says it wants to fix the issues now, rather than after the fact.
There is still no word as to whether the blocking bug was fixed that was preventing the release of Redstone 4, otherwise known as the "Spring Creators Update".
"You can upgrade your PC to Windows 10 version 1803 by joining the Windows Insider program, however, Microsoft has always recommended users to avoid the insider builds on primary PCs due to the driver compatibility issues and bugs, so it's better to wait". Redmond is expected to start a public rollout of Redstone 4 by the end of this month, although that could change anytime.More news: Quadri wins silver as Gold Coast 2018 ends - Punch Newspapers
The discovery of build 17134 of Windows 10 last week came as both a surprise and a disappointment, with those looking forward to the next big feature update realizing that this nearly certainly meant a delay. "In certain cases, these reliability issues could have led to a higher percentage of (BSOD) on PCs for example", said Sarkar in the post. This caused Microsoft to delay the public release indefinitely, and demote build 17133 from RTM status.
Addresses a PDF security issue in Microsoft Edge. According to some reports, Microsoft was going to release it to non-Insiders on Tuesday, but that got delayed and the company ended up releasing a cumulative update, build 17133.73, to Insiders.
Nevertheless, Windows 10 build 17134 is the new RTM build for the spring feature update. This just reinforces that Windows Insiders are critical to helping us find and fix issues before releasing feature updates to all our customers so thank you!