Could you post a few example URLs? Also, what exactly happens with URLs like that – does the plugin parse them incorrectly, does it report them as “404 Not Found” even though they’re fine, or something else?
Hmm, I can’t seem to reproduce the problem. When I add that example link to a post, the plugin parses it correctly – it doesn’t get cut off at the comma.
Some more ideas:
Is the link a normal HTML link, a plaintext URL, an image, part of a custom field, or something else? So far I only tested your example URL in HTML/plaintext.
If it’s not just a plaintext URL, can you post the full code for the link?
Are you sure that’s a normal comma and not some special Unicode character? For example, sometimes copying a link from MS Word can inadvertently add certain invisible characters to the URL.