The browser version of Miiverse was built for Mobile Phones and PC.
3DS is getting its own Miiverse app later, so I don't see a reason for it to work on the Browser.
On a side note, the Internet Browser works great for me for the purposes I need it for. --- Official President of the NST 'But Neku, I thought you couldn't afford to lose? Give up on yourself, and you give up on the world.' - Joshua
The only reason the 3DS browser should be used at all is to pause a game when you're stuck, check GameFAQs to see how to beat it, and then resume playing. --- abbyhaxxor<3 I always rush here to tell GameFAQs my problems!
3DS's doesn't have much RAM, and only dedicates a tiny amount of it to the browser, that's why.
That's also why it's a generally terrible browser. It's really only marginally better than PSP's crappy 2004 browser. --- PS3/Vita ID: Nnamz <-- Please message before add. Otherwise will not accept. 3DS Friend Code: 4527 - 7250 - 9769 <-- Inbox me your FC.
I'd wonder if it wouldn't have a problem with loading all of the images on a standard Miiverse page.
But, it does look like the 3DS browser's UserAgent string is indeed what the site's using to block the 3DS browser. I changed my Firefox UserAgent string to that of the 3DS ("Mozilla/5.0 (Nintendo 3DS; U; ; en) Version/1.7498.US"), and the Miiverse site blocked it. --- Currently ignoring: Real Life