I've just upgraded from EE 2.5.3 to 2.6.1 and am fighting through all the damage it's done to my site. At the moment I'm stuck on the seeming failure of WYGWAM (3.1.1).
I'm having the same issue which is mentioned here but which wasn't resolved in a public or global way.
Whether editing existing content, creating new content, or even creating a new field group and channel and then creating new content with that, I see the same behavior:
The WYGWAM field flashes once quickly (blank white for new content, white with raw source content visible for existing content) and then disappears to show only the grey background of the console.
My production site still uses WYGWAM 2.3.5 but there is no evidence of a skin.js file in that package, so that "fix" mentioned in another post is not applicable.
Anybody have any ideas where I can look, or what I can do to debug this?
I haven't yet tried un-installing and reinstalling, because there doesn't seem to be a way to do that without losing all the data, which I very much want to avoid.
[brief update: just discovered that WYGWAM 3.1.2 is available. Installed it, problem remains.]
[Sorry, forgot to list my installed addons] ab_pagination, assets, ce_cache, ce_str, child_categories, force_ssl, freeform, matrix, my_title_control, playa, primary_category, sitemap, str_rexp, taggable, tagstripper, trunchtml, url_encode, wygwam