Github user mcgilman commented on the issue:
https://github.com/apache/nifi/pull/1334
Thanks for the feedback. That button is present based on the users
permission to modify the template [1]. Looking at the screenshot, the button
has been added to the DOM so the permissions to the template are correct. I
believe the button has just wrapped to the next line. Now the question is why
has this happened.
Let's try to eliminate one other simple possibility first. The templates
page is loaded via an iframe. This can sometimes cause caching issues.
Resources are cached according to URL so if you access the instance differently
(different scheme, host, or port) when bypassing the proxy, this may be what's
happening. Opening the templates page directly (outside of the iframe) will
allow you to clear the cache. This doesn't happen reliably when loading through
an iframe.
Can you try popping the page out by clicking the arrow button next to the
close 'X' in the upper right-hand corner of the shell? Once the page is in it's
own page/tab can you clear the cache or do a hard refresh to see if that makes
a difference?
Thanks.
[1]
https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-web/nifi-web-ui/src/main/webapp/js/nf/templates/nf-templates-table.js#L265
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