Ugh! Everything is slow and sometimes my equations come out wrong!
Unfortunately, right now Codecogs is very slow and unreliable (try rendering on their website, and you'll see what I mean). Texrendr recently changed to be much uglier (again, check out their site) and Sciweavers sometimes switches out the equations with other random equations (this is very rare however, and rerendering will almost certainly fix it).

Because I rely on these services, there is nothing I can do. I'm happy to take suggestions on alternate renderers if you know any that provide links to images at autolatex@gmail.com, but until these stabilize there is nothing I can do.

Nothing works! It says "Error: Please reload." when I try to use it.

After installing do the following
1. Go to a Google Docs file
2. Click Add-ons
3. Click Document Add-ons
4. Under Auto-Latex Equations, click USE (it will appear at the bottom of Auto-LaTeX option)

And it should work. Email autolatex@gmail.com if it still doesn't work!

The add-on says "Sorry, the script has conflicting authorizations. Try signing out of other active Gsuite accounts." 

The add-on requires only one email accounts to be signed in at a time. Try signing out of all other G-Suite accounts and trying again. You can also switch from gsuite profiles to chrome profiles as described here: https://support.google.com/chrome/answer/2364824, or try downloading Chromium and Google Chrome Canary to put your alternate accounts on instead.

To help resolve this problem faster, put pressure on Google by starring the issue here: https://issuetracker.google.com/issues/69270374.

Why are my inline equations not perfectly aligned?

To make a whole line aligned with the equation, simply enclose the words in \text{} and render them as well.

Unfortunately, Google Docs inline images only allows me to align the bottom of the equation with the bottom of the line. Here are other possible workarounds:
- Manually select each image then select wrap text and center it on the line. Note that this may remove the link, which may make it impossible to derender.
- Make the font of only the equation smaller so that it automatically lines up with the top of the text, which might be achieved by making the rest of your document a bigger font, or by typing all your equations in size 10 font or so. 
- Render the text surrounding the equation as well, but enclose the text in a \text{} block so that it is not rendered like math. This will align the text perfectly with the math with an identical font.

As of right now, the Google Docs programming language does not let me center the image as an inline image, and support to change it into a wrapped equation is minimal, as this is a brand-new experimental feature. 

How do I derender all equations?

Click anywhere in the sidebar then click ctrl+q. All the equations in the doc should derender.

How do I render some equations as automatic and others as inline?

1. Enter each inline equation using the $$...$$ delimiter.
2. Enter each display equation using the \[…\] delimiters.
3. Render all the inline equations in the document by selecting the settings size = Inline and delimiter style = $$...$$, then click Render Equations.
4. Separately, render all the display equations in the document by selecting the settings size = Automatic and delimiter style =  \[…\], then click Render Equations. 
(Answer suggestion credit to Jim R.)

How can I make an equation over multiple lines?

Simply use shift+enter instead of enter when going to the next line within an equation!

Why does my equation not de-render?

Click the equation, then the left arrow key so the cursor is just before the equation. The image needs to still have its link!