Intermittent VisualEditor load failures
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Description

Over the last several days, I've been getting sporadic instances (at least five) where I've successfully loaded the read version of a Wikipedia page, but clicking the "Edit" button (or adding the parameter veaction=edit to the URL) just produces the same effect as reloading the read version of a page, but with the proper edit URL.

When I inspect the page, there are a few indications that something different from the read view has been loaded (for example, there's an invisible <div class="ve-init-mw-viewPageTarget-progress">), but not many (for example, ve.dm remains undefined).

Attached is a video of one of these session (warning: it's 47 MB!) on the production English Wikipedia.

Browser: Firefox 39.0a2

Neil_P._Quinn_WMF updated the task description. (Show Details)
Neil_P._Quinn_WMF raised the priority of this task from to Unbreak Now!.
Restricted Application added a subscriber: Aklapper. · View Herald TranscriptMay 14 2015, 12:13 AM
Neil_P._Quinn_WMF set Security to None.
Krenair added a subscriber: Krenair.
Krenair added a subscriber: Krinkle.

I tried to reproduce this issue a few times in Chrome 44 with no luck, CCing Timo in case he has any ideas (ve.dm not getting defined, but some VE modules clearly loaded, and nothing in console?)

@Krenair, @Krinkle, just in case you didn't see it in the task description: I still have the Claude Monet tab open, and it's still displaying the same behavior when I refresh the page. (However, when I load the same page in a new tab, it loads fine). Let me know if there's anything I can do to give you more data. We can do a Google Hangout and I can screenshare if that would help.

@Krenair: I was able to reproduce it with Firefox only. It happens in master too.

Nnemo added a subscriber: Nnemo.May 16 2015, 10:10 PM

As this has "Unbreak now" priority and no updates for more than two weeks, is that still a realistic priority?
If so, please set an assignee for this task (or adjust the priority). Thank you!

Neil_P._Quinn_WMF lowered the priority of this task from Unbreak Now! to High.Jun 1 2015, 11:02 PM
Neil_P._Quinn_WMF lowered the priority of this task from High to Normal.

I just got a big rash of these in 41.0a2, on both enwiki and eswiki.

I just got a big rash of these in 41.0a2, on both enwiki and eswiki.

@Neil_P._Quinn_WMF: Still an issue? Or has this magically vanished?

@Aklapper: Nothing since I posted that comment. It might recur since I've found it to be very intermittent, but we could close it and reopen if necessary.

Aklapper lowered the priority of this task from Normal to Low.Aug 25 2015, 12:12 PM