So I keep going to my messages, and clicking on a message, then it NEVER loads. So I refresh. and then I cant comment. Even though I was JUST signed in a minute ago, it signs me out and puts me through the hassle of signing back in. And I STILL can't find what I need because it STILL never loads!
My browser / operating system: Windows NT 10.0, Firefox 68.0, No Flash version detected

This appears to be the issue you're having.

Here are some possible fixes (the comment one usually works for me):

Scratch Wiki wrote:

Sometimes, if a user comments on one's profile later, the comment that previously would not show may appear. Then, the user can view, reply, delete, or report the comment. This works with most users, but is only temporary. This will need to be done again when another comment will not show.

Clearing the browser's cache may help fix this problem. If one uses Google Chrome, they can go to “Clear Browser Data” in Settings, click “Advanced,” then select the following:
Browsing History
Download History
Cookies and other site data
Cached images and files
To clear the entire cache, one can select “All time.” Then, they can click “Clear Data.”
Note Warning: Clearing one's cache may sign the user out of some websites, requiring the person to login again. Also, it may take longer to open some websites because images and other graphics will need to be reloaded.

If the Scratch Wiki words it a bit weirdly, hopefully my explanation makes more sense:

Leafsparkle wrote:

Go to the main profile or studio page (rather than the direct link to the comment). Leave another comment on the page. Then, look for the original comment. It should now appear, and clicking the direct link to it should not sign you out.

Edited to add my explanation, then edited again to explain that I edited it.

Leafsparkle wrote:

This appears to be the issue you're having.

Here are some possible fixes (the comment one usually works for me):

Scratch Wiki wrote:

Sometimes, if a user comments on one's profile later, the comment that previously would not show may appear. Then, the user can view, reply, delete, or report the comment. This works with most users, but is only temporary. This will need to be done again when another comment will not show.

Clearing the browser's cache may help fix this problem. If one uses Google Chrome, they can go to “Clear Browser Data” in Settings, click “Advanced,” then select the following:
Browsing History
Download History
Cookies and other site data
Cached images and files
To clear the entire cache, one can select “All time.” Then, they can click “Clear Data.”
Note Warning: Clearing one's cache may sign the user out of some websites, requiring the person to login again. Also, it may take longer to open some websites because images and other graphics will need to be reloaded.

If the Scratch Wiki words it a bit weirdly, hopefully my explanation makes more sense:

Leafsparkle wrote:

Go to the main profile or studio page (rather than the direct link to the comment). Leave another comment on the page. Then, look for the original comment. It should now appear, and clicking the direct link to it should not sign you out.

Edited to add my explanation, then edited again to explain that I edited it.

Good idea! Sadly, this won't work until the page actually LOADS… which it never does. Maybe it's because of my browser/OS:
My browser / operating system: Windows NT 10.0, Firefox 68.0, No Flash version detected

I know the direct link to the comment won't load. But have you gone to the link to just the studio or profile, with no /#comments- after it?

Yeah, i have. Usually I'm just trying to get to the studio the comment's on