Up until about yesterday, I was able to add markdown links to a local application within the description area of my Trello Cards. The application uses a custom url protocol to produce a url like the following:ttstudio://server:99//Product/dfct?recordID=3836 I've been adding these references to my trello cards in the markdown format: [3836](ttstudio://server:99//Product/dfct?recordID=3836)where they'd render as<a href=ttstudio://server:99//Product/dfct?recordID=3836>3836</a>I just went back to one of these cards and noticed that the href now renders as <a href=#>3836</a>Which completely disables the link. Changing to a standard protocol (http, https, ftp) renders the href correctly, which makes me think they've recently disabled custom/non-standard url protocols. Anyone else experiencing this? Anyone know if this was changed on purpose and why? Is this documented anywhere that I can reference? Their development board doesn't seem to indicate any changes were made, but I'm sure they don't post every change they make. 
Trello now sanitizing URLs / disallowing custom url protocols?
trello;url;markdown
Non-standard protocols were disabled as a security precaution, to prevent the use of dangerous URIs (e.g. javascript:) from being rendered.See https://github.com/evilstreak/markdown-js/pull/52 for a pull request with more details.