Plone novice: Site appears unstyled instead of Sunburst - plone

My site used the Sunburst theme without any custom style sheets – at most I would update the logo. I recently updated the logo and front-page after a long absence. The logo was successfully updated, however something else happened and now the site appears unstyled. Skip to content/Skip to navigation text links (for accessibility) appear at the top where they had not previously.
I checked portal_skins/custom, but there was no ploneCustom.css file there to remove, only the logo.png. I tried changing the theme to Classic but it also appeared unstyled, so then I changed it back to Sunburst. Next I went to portal_skins/sunburst_styles and pressed the customize button for public.css and ploneCustom.css, hoping to override the current style. Even though the style files were copied to portal_skins/custom (I did not modify the copies), the site still appears unstyled.
Please help a grad student whose occasional task is to maintain a Plone site (server is running Plone 4.) The server admin is away at a conference – the previous server admin who had the Plone expertise graduated last fall and is now out of the country (and also at the same conference.) I’ve read the documentations and searched for similar issues, but am at wit’s end.
I would greatly appreciate any guidance in how to revert back to the default Sunburst theme styles!

Sometimes the "Plone Classic Theme" seems to become applied when upgrading. In the Theme control panel ( http://yoursite/##skins-controlpanel ) make sure that "Sunburst" is selected.

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I make frequent updates to the website for a small, regional food and wine festival (duxburyfoodandwinefestival.com, built using Wordpress). When I recently went to edit/update the site on Wordpress with information on this year's events, I was (and still am) unable to view existing content in the text editor fields (both visual and text). The text is there when I highlight, but it's all white.
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One page of content as it appears online
The same page of content in text editor view, content invisible/white
Highlighting show that the text is present, but white on white field-- not useful for editing/composing text
I solved my own issue. My particular problem had to do with the most recent update to WordPress and a conflict with an existing plugin on our site ("WP Memory Load and db size Usage"). I opened a second browser window and systematically tried deactivating one plugin at a time until I reached the problem child (it was last, of course). By refreshing my content editor view in a separate window after each plugin deactivation, I was able to isolate the problem plugin. When I deactivated the plugin in question and refreshed my content editor view, the text returned to black/visible in both visual and html text views. I am now operating as-normal with that single plugin deactivated.

Wordpress Theme Design is not changing

I'm facing a weird problem in wordpress. Every change I make in content and all others except "Theme Design" works great. Every change I make in "Theme Design" it takes almost endless time like when I first made change and then I keep trying on changing and saving different settings of Theme Design, it took almost 2 hours to show my change, same thing happened next time.
I'm using "venedor Green-pink" Theme.
This is my web on which I'm working on: http://www.teuscherchocolate-oc.com/
Background of header is transparent, I made this change 5 hours ago, now I've changed the background to grey color but the changing is not showing up.
It sounds more like a browser issue. When logged into wordpress you should see all changes, even to a simple stylesheet, etc. However, outside of wordpress it could take an undefined amount of time for a browser to clear it's cache automatically for a new stylesheet it doesn't know is updated.
You could consider adding version numbers to the files responsible for your Theme Design changes. In other words, find what styles are being updatted and where. Tack on ?v=1 to the file.
If you clear your cache, do the changes show?

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I upgraded one my Plone installations from 4.1.something to a 4.2.4 a while back. A weird thing then appeared: when editing any content, the fieldsets for that editing form all appeared one after another and not in their respective tabs.
Now when a user edits the content and hits "Save" they get a warning from the browser that they are about to leave the page. Paradoxically the user has to hit Leave Page because the changes have been changed. Clicking on one of the tab headings causes the changes to be lost and the edit session abandoned.
I don't think it's a theme thing - all the Plone instances on that server, each with a different theme - are exhibiting this problem.
Where would I start looking to fix this?
Sounds like you have a javascript error.
The fieldset tabs are handled in pure JS; all but the first are hidden on page load.
Look in your browser console and see what is tripping up the JS and preventing the code from moving the fieldsets to tabs.

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My media library no longer shows up in the media browser. Although all 6,000+ images are still there, none show up.
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Any ideas? I was hoping to re-launch my website today, but it looks like I might have to put it on hold...
Get ahold of the devs for your framework. Your experience is not an uncommon one. It has happened to my sites several times. Unless you want to tweak the php yourself, they will have to help you.
Managed to sort this out. Turns out a function I had written to add a custom field to menu items broke the entire back end. Thanks for the help everyone!

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