Windows Insiders went without a new PC build release last week, and it looks that wait will continue through this week as well. Windows Insider chief Dona Sarkar has now confirmed on Twitter that there won't be any new build releases this week due to a number of issues.
The last Windows 10 PC build to be released to Insiders was 16257, which came at the beginning of August. The latest Mobile Insider build was a little more recent, with build 15240 having arrived last week. Sarkar's wording presumably covers both PC and Mobile builds, so Insiders can probably relax and hope for another build to hit sometime next week.