Steps to replicate:
- Visit an article with ?tour=firstedit, like http://en.wikipedia.beta.wmflabs.org/wiki/0.22949446047648203_Moved?tour=firstedit
- Click edit
- Attempt to Preview while the associated guider is visible and attached
At this step, I intermittently get no response from clicking Preview. The same applies to Save.
This bug is not happening on enwiki right now but I also get in on my MediaWiki-Vagrant instance after pulling down master.
Browsers: I get this in Chrome and Firefox latest versions.