It sounds like two things could be happening to you.

First, comments with a highly negative score will be hidden. The comment must be pretty bad for this to happen.

Second, there is a spam filter. It usually filters comments with lots of links, or comments like "lol" and "haha". Of course it can filter perfectly legitimate comments too, but there's a pretty high success rate.

These are the only two reasons for a comment to be hidden. If you'd like, you can send me a link to an image that you commented on and I can tell you what happened.
2 years ago
0
Just wanted to let you know that this should be fixed. Care to try it out and let me know how it works for you?
2 years ago
0
Thanks, Sushubh! That's exactly the reason, and I couldn't have said it better myself.
2 years ago
0
Well as the site grows, the needs of users grow too :( For what it's worth, the flash version has been the default for over a year.
2 years ago
+1
Ok, well that settles it. If they display fine on other sites, then it has to be an issue/feature within Plurk. Have you tried talking with them about it?
2 years ago
0
Have you tried using the same links in another forum or something outside of Plurk?
2 years ago
0
It sounds like it could either be a problem with Plurk, or Imgur-specific code within Plurk that's displaying the thumbnail rather than the image. Unless you can link me to an image that's displaying the thumbnail no matter what you tell it...
2 years ago
0
That image displays perfectly for me. You can even compare it with http://i.imgur.com/PRld1l.png and http://i.imgur.com/PRld1s.png
2 years ago
0
Thanks! It's been fixed.
2 years ago
+1
The limitation from uploading from the homepage has to do with the URLs that are generated. After 40 images, the URL in the end is 239 characters long and if it's any longer then Apache screws up. I can't lift this limit without changing the URL scheme.

The limitation with HTML5 uploads is that the image is processed AFTER it's uploaded. So, uploading large images will be much slower. You won't really notice much of a difference if the images you're uploading are under 1MB or so.
2 years ago
+1